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Commit | Line | Data |
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ca557f44 AC |
1 | /* Target-struct-independent code to start (run) and stop an inferior |
2 | process. | |
8926118c | 3 | |
32d0add0 | 4 | Copyright (C) 1986-2015 Free Software Foundation, Inc. |
c906108c | 5 | |
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 11 | (at your option) any later version. |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b | 18 | You should have received a copy of the GNU General Public License |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
20 | |
21 | #include "defs.h" | |
45741a9c | 22 | #include "infrun.h" |
c906108c SS |
23 | #include <ctype.h> |
24 | #include "symtab.h" | |
25 | #include "frame.h" | |
26 | #include "inferior.h" | |
27 | #include "breakpoint.h" | |
03f2053f | 28 | #include "gdb_wait.h" |
c906108c SS |
29 | #include "gdbcore.h" |
30 | #include "gdbcmd.h" | |
210661e7 | 31 | #include "cli/cli-script.h" |
c906108c SS |
32 | #include "target.h" |
33 | #include "gdbthread.h" | |
34 | #include "annotate.h" | |
1adeb98a | 35 | #include "symfile.h" |
7a292a7a | 36 | #include "top.h" |
c906108c | 37 | #include <signal.h> |
2acceee2 | 38 | #include "inf-loop.h" |
4e052eda | 39 | #include "regcache.h" |
fd0407d6 | 40 | #include "value.h" |
06600e06 | 41 | #include "observer.h" |
f636b87d | 42 | #include "language.h" |
a77053c2 | 43 | #include "solib.h" |
f17517ea | 44 | #include "main.h" |
186c406b TT |
45 | #include "dictionary.h" |
46 | #include "block.h" | |
034dad6f | 47 | #include "mi/mi-common.h" |
4f8d22e3 | 48 | #include "event-top.h" |
96429cc8 | 49 | #include "record.h" |
d02ed0bb | 50 | #include "record-full.h" |
edb3359d | 51 | #include "inline-frame.h" |
4efc6507 | 52 | #include "jit.h" |
06cd862c | 53 | #include "tracepoint.h" |
be34f849 | 54 | #include "continuations.h" |
b4a14fd0 | 55 | #include "interps.h" |
1bfeeb0f | 56 | #include "skip.h" |
28106bc2 SDJ |
57 | #include "probe.h" |
58 | #include "objfiles.h" | |
de0bea00 | 59 | #include "completer.h" |
9107fc8d | 60 | #include "target-descriptions.h" |
f15cb84a | 61 | #include "target-dcache.h" |
d83ad864 | 62 | #include "terminal.h" |
ff862be4 | 63 | #include "solist.h" |
372316f1 | 64 | #include "event-loop.h" |
243a9253 | 65 | #include "thread-fsm.h" |
8d297bbf | 66 | #include "common/enum-flags.h" |
c906108c SS |
67 | |
68 | /* Prototypes for local functions */ | |
69 | ||
96baa820 | 70 | static void signals_info (char *, int); |
c906108c | 71 | |
96baa820 | 72 | static void handle_command (char *, int); |
c906108c | 73 | |
2ea28649 | 74 | static void sig_print_info (enum gdb_signal); |
c906108c | 75 | |
96baa820 | 76 | static void sig_print_header (void); |
c906108c | 77 | |
74b7792f | 78 | static void resume_cleanups (void *); |
c906108c | 79 | |
96baa820 | 80 | static int hook_stop_stub (void *); |
c906108c | 81 | |
96baa820 JM |
82 | static int restore_selected_frame (void *); |
83 | ||
4ef3f3be | 84 | static int follow_fork (void); |
96baa820 | 85 | |
d83ad864 DB |
86 | static int follow_fork_inferior (int follow_child, int detach_fork); |
87 | ||
88 | static void follow_inferior_reset_breakpoints (void); | |
89 | ||
96baa820 | 90 | static void set_schedlock_func (char *args, int from_tty, |
488f131b | 91 | struct cmd_list_element *c); |
96baa820 | 92 | |
a289b8f6 JK |
93 | static int currently_stepping (struct thread_info *tp); |
94 | ||
96baa820 | 95 | void _initialize_infrun (void); |
43ff13b4 | 96 | |
e58b0e63 PA |
97 | void nullify_last_target_wait_ptid (void); |
98 | ||
2c03e5be | 99 | static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info *); |
2484c66b UW |
100 | |
101 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); | |
102 | ||
2484c66b UW |
103 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); |
104 | ||
8550d3b3 YQ |
105 | static int maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc); |
106 | ||
372316f1 PA |
107 | /* Asynchronous signal handler registered as event loop source for |
108 | when we have pending events ready to be passed to the core. */ | |
109 | static struct async_event_handler *infrun_async_inferior_event_token; | |
110 | ||
111 | /* Stores whether infrun_async was previously enabled or disabled. | |
112 | Starts off as -1, indicating "never enabled/disabled". */ | |
113 | static int infrun_is_async = -1; | |
114 | ||
115 | /* See infrun.h. */ | |
116 | ||
117 | void | |
118 | infrun_async (int enable) | |
119 | { | |
120 | if (infrun_is_async != enable) | |
121 | { | |
122 | infrun_is_async = enable; | |
123 | ||
124 | if (debug_infrun) | |
125 | fprintf_unfiltered (gdb_stdlog, | |
126 | "infrun: infrun_async(%d)\n", | |
127 | enable); | |
128 | ||
129 | if (enable) | |
130 | mark_async_event_handler (infrun_async_inferior_event_token); | |
131 | else | |
132 | clear_async_event_handler (infrun_async_inferior_event_token); | |
133 | } | |
134 | } | |
135 | ||
0b333c5e PA |
136 | /* See infrun.h. */ |
137 | ||
138 | void | |
139 | mark_infrun_async_event_handler (void) | |
140 | { | |
141 | mark_async_event_handler (infrun_async_inferior_event_token); | |
142 | } | |
143 | ||
5fbbeb29 CF |
144 | /* When set, stop the 'step' command if we enter a function which has |
145 | no line number information. The normal behavior is that we step | |
146 | over such function. */ | |
147 | int step_stop_if_no_debug = 0; | |
920d2a44 AC |
148 | static void |
149 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
150 | struct cmd_list_element *c, const char *value) | |
151 | { | |
152 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
153 | } | |
5fbbeb29 | 154 | |
1777feb0 | 155 | /* In asynchronous mode, but simulating synchronous execution. */ |
96baa820 | 156 | |
43ff13b4 JM |
157 | int sync_execution = 0; |
158 | ||
b9f437de PA |
159 | /* proceed and normal_stop use this to notify the user when the |
160 | inferior stopped in a different thread than it had been running | |
161 | in. */ | |
96baa820 | 162 | |
39f77062 | 163 | static ptid_t previous_inferior_ptid; |
7a292a7a | 164 | |
07107ca6 LM |
165 | /* If set (default for legacy reasons), when following a fork, GDB |
166 | will detach from one of the fork branches, child or parent. | |
167 | Exactly which branch is detached depends on 'set follow-fork-mode' | |
168 | setting. */ | |
169 | ||
170 | static int detach_fork = 1; | |
6c95b8df | 171 | |
237fc4c9 PA |
172 | int debug_displaced = 0; |
173 | static void | |
174 | show_debug_displaced (struct ui_file *file, int from_tty, | |
175 | struct cmd_list_element *c, const char *value) | |
176 | { | |
177 | fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value); | |
178 | } | |
179 | ||
ccce17b0 | 180 | unsigned int debug_infrun = 0; |
920d2a44 AC |
181 | static void |
182 | show_debug_infrun (struct ui_file *file, int from_tty, | |
183 | struct cmd_list_element *c, const char *value) | |
184 | { | |
185 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
186 | } | |
527159b7 | 187 | |
03583c20 UW |
188 | |
189 | /* Support for disabling address space randomization. */ | |
190 | ||
191 | int disable_randomization = 1; | |
192 | ||
193 | static void | |
194 | show_disable_randomization (struct ui_file *file, int from_tty, | |
195 | struct cmd_list_element *c, const char *value) | |
196 | { | |
197 | if (target_supports_disable_randomization ()) | |
198 | fprintf_filtered (file, | |
199 | _("Disabling randomization of debuggee's " | |
200 | "virtual address space is %s.\n"), | |
201 | value); | |
202 | else | |
203 | fputs_filtered (_("Disabling randomization of debuggee's " | |
204 | "virtual address space is unsupported on\n" | |
205 | "this platform.\n"), file); | |
206 | } | |
207 | ||
208 | static void | |
209 | set_disable_randomization (char *args, int from_tty, | |
210 | struct cmd_list_element *c) | |
211 | { | |
212 | if (!target_supports_disable_randomization ()) | |
213 | error (_("Disabling randomization of debuggee's " | |
214 | "virtual address space is unsupported on\n" | |
215 | "this platform.")); | |
216 | } | |
217 | ||
d32dc48e PA |
218 | /* User interface for non-stop mode. */ |
219 | ||
220 | int non_stop = 0; | |
221 | static int non_stop_1 = 0; | |
222 | ||
223 | static void | |
224 | set_non_stop (char *args, int from_tty, | |
225 | struct cmd_list_element *c) | |
226 | { | |
227 | if (target_has_execution) | |
228 | { | |
229 | non_stop_1 = non_stop; | |
230 | error (_("Cannot change this setting while the inferior is running.")); | |
231 | } | |
232 | ||
233 | non_stop = non_stop_1; | |
234 | } | |
235 | ||
236 | static void | |
237 | show_non_stop (struct ui_file *file, int from_tty, | |
238 | struct cmd_list_element *c, const char *value) | |
239 | { | |
240 | fprintf_filtered (file, | |
241 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
242 | value); | |
243 | } | |
244 | ||
d914c394 SS |
245 | /* "Observer mode" is somewhat like a more extreme version of |
246 | non-stop, in which all GDB operations that might affect the | |
247 | target's execution have been disabled. */ | |
248 | ||
d914c394 SS |
249 | int observer_mode = 0; |
250 | static int observer_mode_1 = 0; | |
251 | ||
252 | static void | |
253 | set_observer_mode (char *args, int from_tty, | |
254 | struct cmd_list_element *c) | |
255 | { | |
d914c394 SS |
256 | if (target_has_execution) |
257 | { | |
258 | observer_mode_1 = observer_mode; | |
259 | error (_("Cannot change this setting while the inferior is running.")); | |
260 | } | |
261 | ||
262 | observer_mode = observer_mode_1; | |
263 | ||
264 | may_write_registers = !observer_mode; | |
265 | may_write_memory = !observer_mode; | |
266 | may_insert_breakpoints = !observer_mode; | |
267 | may_insert_tracepoints = !observer_mode; | |
268 | /* We can insert fast tracepoints in or out of observer mode, | |
269 | but enable them if we're going into this mode. */ | |
270 | if (observer_mode) | |
271 | may_insert_fast_tracepoints = 1; | |
272 | may_stop = !observer_mode; | |
273 | update_target_permissions (); | |
274 | ||
275 | /* Going *into* observer mode we must force non-stop, then | |
276 | going out we leave it that way. */ | |
277 | if (observer_mode) | |
278 | { | |
d914c394 SS |
279 | pagination_enabled = 0; |
280 | non_stop = non_stop_1 = 1; | |
281 | } | |
282 | ||
283 | if (from_tty) | |
284 | printf_filtered (_("Observer mode is now %s.\n"), | |
285 | (observer_mode ? "on" : "off")); | |
286 | } | |
287 | ||
288 | static void | |
289 | show_observer_mode (struct ui_file *file, int from_tty, | |
290 | struct cmd_list_element *c, const char *value) | |
291 | { | |
292 | fprintf_filtered (file, _("Observer mode is %s.\n"), value); | |
293 | } | |
294 | ||
295 | /* This updates the value of observer mode based on changes in | |
296 | permissions. Note that we are deliberately ignoring the values of | |
297 | may-write-registers and may-write-memory, since the user may have | |
298 | reason to enable these during a session, for instance to turn on a | |
299 | debugging-related global. */ | |
300 | ||
301 | void | |
302 | update_observer_mode (void) | |
303 | { | |
304 | int newval; | |
305 | ||
306 | newval = (!may_insert_breakpoints | |
307 | && !may_insert_tracepoints | |
308 | && may_insert_fast_tracepoints | |
309 | && !may_stop | |
310 | && non_stop); | |
311 | ||
312 | /* Let the user know if things change. */ | |
313 | if (newval != observer_mode) | |
314 | printf_filtered (_("Observer mode is now %s.\n"), | |
315 | (newval ? "on" : "off")); | |
316 | ||
317 | observer_mode = observer_mode_1 = newval; | |
318 | } | |
c2c6d25f | 319 | |
c906108c SS |
320 | /* Tables of how to react to signals; the user sets them. */ |
321 | ||
322 | static unsigned char *signal_stop; | |
323 | static unsigned char *signal_print; | |
324 | static unsigned char *signal_program; | |
325 | ||
ab04a2af TT |
326 | /* Table of signals that are registered with "catch signal". A |
327 | non-zero entry indicates that the signal is caught by some "catch | |
328 | signal" command. This has size GDB_SIGNAL_LAST, to accommodate all | |
329 | signals. */ | |
330 | static unsigned char *signal_catch; | |
331 | ||
2455069d UW |
332 | /* Table of signals that the target may silently handle. |
333 | This is automatically determined from the flags above, | |
334 | and simply cached here. */ | |
335 | static unsigned char *signal_pass; | |
336 | ||
c906108c SS |
337 | #define SET_SIGS(nsigs,sigs,flags) \ |
338 | do { \ | |
339 | int signum = (nsigs); \ | |
340 | while (signum-- > 0) \ | |
341 | if ((sigs)[signum]) \ | |
342 | (flags)[signum] = 1; \ | |
343 | } while (0) | |
344 | ||
345 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
346 | do { \ | |
347 | int signum = (nsigs); \ | |
348 | while (signum-- > 0) \ | |
349 | if ((sigs)[signum]) \ | |
350 | (flags)[signum] = 0; \ | |
351 | } while (0) | |
352 | ||
9b224c5e PA |
353 | /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of |
354 | this function is to avoid exporting `signal_program'. */ | |
355 | ||
356 | void | |
357 | update_signals_program_target (void) | |
358 | { | |
a493e3e2 | 359 | target_program_signals ((int) GDB_SIGNAL_LAST, signal_program); |
9b224c5e PA |
360 | } |
361 | ||
1777feb0 | 362 | /* Value to pass to target_resume() to cause all threads to resume. */ |
39f77062 | 363 | |
edb3359d | 364 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
365 | |
366 | /* Command list pointer for the "stop" placeholder. */ | |
367 | ||
368 | static struct cmd_list_element *stop_command; | |
369 | ||
c906108c SS |
370 | /* Nonzero if we want to give control to the user when we're notified |
371 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 372 | int stop_on_solib_events; |
f9e14852 GB |
373 | |
374 | /* Enable or disable optional shared library event breakpoints | |
375 | as appropriate when the above flag is changed. */ | |
376 | ||
377 | static void | |
378 | set_stop_on_solib_events (char *args, int from_tty, struct cmd_list_element *c) | |
379 | { | |
380 | update_solib_breakpoints (); | |
381 | } | |
382 | ||
920d2a44 AC |
383 | static void |
384 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
385 | struct cmd_list_element *c, const char *value) | |
386 | { | |
387 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
388 | value); | |
389 | } | |
c906108c | 390 | |
c906108c SS |
391 | /* Nonzero after stop if current stack frame should be printed. */ |
392 | ||
393 | static int stop_print_frame; | |
394 | ||
e02bc4cc | 395 | /* This is a cached copy of the pid/waitstatus of the last event |
9a4105ab AC |
396 | returned by target_wait()/deprecated_target_wait_hook(). This |
397 | information is returned by get_last_target_status(). */ | |
39f77062 | 398 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
399 | static struct target_waitstatus target_last_waitstatus; |
400 | ||
0d1e5fa7 PA |
401 | static void context_switch (ptid_t ptid); |
402 | ||
4e1c45ea | 403 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 | 404 | |
53904c9e AC |
405 | static const char follow_fork_mode_child[] = "child"; |
406 | static const char follow_fork_mode_parent[] = "parent"; | |
407 | ||
40478521 | 408 | static const char *const follow_fork_mode_kind_names[] = { |
53904c9e AC |
409 | follow_fork_mode_child, |
410 | follow_fork_mode_parent, | |
411 | NULL | |
ef346e04 | 412 | }; |
c906108c | 413 | |
53904c9e | 414 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
415 | static void |
416 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
417 | struct cmd_list_element *c, const char *value) | |
418 | { | |
3e43a32a MS |
419 | fprintf_filtered (file, |
420 | _("Debugger response to a program " | |
421 | "call of fork or vfork is \"%s\".\n"), | |
920d2a44 AC |
422 | value); |
423 | } | |
c906108c SS |
424 | \f |
425 | ||
d83ad864 DB |
426 | /* Handle changes to the inferior list based on the type of fork, |
427 | which process is being followed, and whether the other process | |
428 | should be detached. On entry inferior_ptid must be the ptid of | |
429 | the fork parent. At return inferior_ptid is the ptid of the | |
430 | followed inferior. */ | |
431 | ||
432 | static int | |
433 | follow_fork_inferior (int follow_child, int detach_fork) | |
434 | { | |
435 | int has_vforked; | |
79639e11 | 436 | ptid_t parent_ptid, child_ptid; |
d83ad864 DB |
437 | |
438 | has_vforked = (inferior_thread ()->pending_follow.kind | |
439 | == TARGET_WAITKIND_VFORKED); | |
79639e11 PA |
440 | parent_ptid = inferior_ptid; |
441 | child_ptid = inferior_thread ()->pending_follow.value.related_pid; | |
d83ad864 DB |
442 | |
443 | if (has_vforked | |
444 | && !non_stop /* Non-stop always resumes both branches. */ | |
445 | && (!target_is_async_p () || sync_execution) | |
446 | && !(follow_child || detach_fork || sched_multi)) | |
447 | { | |
448 | /* The parent stays blocked inside the vfork syscall until the | |
449 | child execs or exits. If we don't let the child run, then | |
450 | the parent stays blocked. If we're telling the parent to run | |
451 | in the foreground, the user will not be able to ctrl-c to get | |
452 | back the terminal, effectively hanging the debug session. */ | |
453 | fprintf_filtered (gdb_stderr, _("\ | |
454 | Can not resume the parent process over vfork in the foreground while\n\ | |
455 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
456 | \"set schedule-multiple\".\n")); | |
457 | /* FIXME output string > 80 columns. */ | |
458 | return 1; | |
459 | } | |
460 | ||
461 | if (!follow_child) | |
462 | { | |
463 | /* Detach new forked process? */ | |
464 | if (detach_fork) | |
465 | { | |
466 | struct cleanup *old_chain; | |
467 | ||
468 | /* Before detaching from the child, remove all breakpoints | |
469 | from it. If we forked, then this has already been taken | |
470 | care of by infrun.c. If we vforked however, any | |
471 | breakpoint inserted in the parent is visible in the | |
472 | child, even those added while stopped in a vfork | |
473 | catchpoint. This will remove the breakpoints from the | |
474 | parent also, but they'll be reinserted below. */ | |
475 | if (has_vforked) | |
476 | { | |
477 | /* Keep breakpoints list in sync. */ | |
478 | remove_breakpoints_pid (ptid_get_pid (inferior_ptid)); | |
479 | } | |
480 | ||
481 | if (info_verbose || debug_infrun) | |
482 | { | |
8dd06f7a DB |
483 | /* Ensure that we have a process ptid. */ |
484 | ptid_t process_ptid = pid_to_ptid (ptid_get_pid (child_ptid)); | |
485 | ||
6f259a23 | 486 | target_terminal_ours_for_output (); |
d83ad864 | 487 | fprintf_filtered (gdb_stdlog, |
79639e11 | 488 | _("Detaching after %s from child %s.\n"), |
6f259a23 | 489 | has_vforked ? "vfork" : "fork", |
8dd06f7a | 490 | target_pid_to_str (process_ptid)); |
d83ad864 DB |
491 | } |
492 | } | |
493 | else | |
494 | { | |
495 | struct inferior *parent_inf, *child_inf; | |
496 | struct cleanup *old_chain; | |
497 | ||
498 | /* Add process to GDB's tables. */ | |
79639e11 | 499 | child_inf = add_inferior (ptid_get_pid (child_ptid)); |
d83ad864 DB |
500 | |
501 | parent_inf = current_inferior (); | |
502 | child_inf->attach_flag = parent_inf->attach_flag; | |
503 | copy_terminal_info (child_inf, parent_inf); | |
504 | child_inf->gdbarch = parent_inf->gdbarch; | |
505 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
506 | ||
507 | old_chain = save_inferior_ptid (); | |
508 | save_current_program_space (); | |
509 | ||
79639e11 | 510 | inferior_ptid = child_ptid; |
d83ad864 DB |
511 | add_thread (inferior_ptid); |
512 | child_inf->symfile_flags = SYMFILE_NO_READ; | |
513 | ||
514 | /* If this is a vfork child, then the address-space is | |
515 | shared with the parent. */ | |
516 | if (has_vforked) | |
517 | { | |
518 | child_inf->pspace = parent_inf->pspace; | |
519 | child_inf->aspace = parent_inf->aspace; | |
520 | ||
521 | /* The parent will be frozen until the child is done | |
522 | with the shared region. Keep track of the | |
523 | parent. */ | |
524 | child_inf->vfork_parent = parent_inf; | |
525 | child_inf->pending_detach = 0; | |
526 | parent_inf->vfork_child = child_inf; | |
527 | parent_inf->pending_detach = 0; | |
528 | } | |
529 | else | |
530 | { | |
531 | child_inf->aspace = new_address_space (); | |
532 | child_inf->pspace = add_program_space (child_inf->aspace); | |
533 | child_inf->removable = 1; | |
534 | set_current_program_space (child_inf->pspace); | |
535 | clone_program_space (child_inf->pspace, parent_inf->pspace); | |
536 | ||
537 | /* Let the shared library layer (e.g., solib-svr4) learn | |
538 | about this new process, relocate the cloned exec, pull | |
539 | in shared libraries, and install the solib event | |
540 | breakpoint. If a "cloned-VM" event was propagated | |
541 | better throughout the core, this wouldn't be | |
542 | required. */ | |
543 | solib_create_inferior_hook (0); | |
544 | } | |
545 | ||
546 | do_cleanups (old_chain); | |
547 | } | |
548 | ||
549 | if (has_vforked) | |
550 | { | |
551 | struct inferior *parent_inf; | |
552 | ||
553 | parent_inf = current_inferior (); | |
554 | ||
555 | /* If we detached from the child, then we have to be careful | |
556 | to not insert breakpoints in the parent until the child | |
557 | is done with the shared memory region. However, if we're | |
558 | staying attached to the child, then we can and should | |
559 | insert breakpoints, so that we can debug it. A | |
560 | subsequent child exec or exit is enough to know when does | |
561 | the child stops using the parent's address space. */ | |
562 | parent_inf->waiting_for_vfork_done = detach_fork; | |
563 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; | |
564 | } | |
565 | } | |
566 | else | |
567 | { | |
568 | /* Follow the child. */ | |
569 | struct inferior *parent_inf, *child_inf; | |
570 | struct program_space *parent_pspace; | |
571 | ||
572 | if (info_verbose || debug_infrun) | |
573 | { | |
6f259a23 DB |
574 | target_terminal_ours_for_output (); |
575 | fprintf_filtered (gdb_stdlog, | |
79639e11 PA |
576 | _("Attaching after %s %s to child %s.\n"), |
577 | target_pid_to_str (parent_ptid), | |
6f259a23 | 578 | has_vforked ? "vfork" : "fork", |
79639e11 | 579 | target_pid_to_str (child_ptid)); |
d83ad864 DB |
580 | } |
581 | ||
582 | /* Add the new inferior first, so that the target_detach below | |
583 | doesn't unpush the target. */ | |
584 | ||
79639e11 | 585 | child_inf = add_inferior (ptid_get_pid (child_ptid)); |
d83ad864 DB |
586 | |
587 | parent_inf = current_inferior (); | |
588 | child_inf->attach_flag = parent_inf->attach_flag; | |
589 | copy_terminal_info (child_inf, parent_inf); | |
590 | child_inf->gdbarch = parent_inf->gdbarch; | |
591 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
592 | ||
593 | parent_pspace = parent_inf->pspace; | |
594 | ||
595 | /* If we're vforking, we want to hold on to the parent until the | |
596 | child exits or execs. At child exec or exit time we can | |
597 | remove the old breakpoints from the parent and detach or | |
598 | resume debugging it. Otherwise, detach the parent now; we'll | |
599 | want to reuse it's program/address spaces, but we can't set | |
600 | them to the child before removing breakpoints from the | |
601 | parent, otherwise, the breakpoints module could decide to | |
602 | remove breakpoints from the wrong process (since they'd be | |
603 | assigned to the same address space). */ | |
604 | ||
605 | if (has_vforked) | |
606 | { | |
607 | gdb_assert (child_inf->vfork_parent == NULL); | |
608 | gdb_assert (parent_inf->vfork_child == NULL); | |
609 | child_inf->vfork_parent = parent_inf; | |
610 | child_inf->pending_detach = 0; | |
611 | parent_inf->vfork_child = child_inf; | |
612 | parent_inf->pending_detach = detach_fork; | |
613 | parent_inf->waiting_for_vfork_done = 0; | |
614 | } | |
615 | else if (detach_fork) | |
6f259a23 DB |
616 | { |
617 | if (info_verbose || debug_infrun) | |
618 | { | |
8dd06f7a DB |
619 | /* Ensure that we have a process ptid. */ |
620 | ptid_t process_ptid = pid_to_ptid (ptid_get_pid (child_ptid)); | |
621 | ||
6f259a23 DB |
622 | target_terminal_ours_for_output (); |
623 | fprintf_filtered (gdb_stdlog, | |
624 | _("Detaching after fork from " | |
79639e11 | 625 | "child %s.\n"), |
8dd06f7a | 626 | target_pid_to_str (process_ptid)); |
6f259a23 DB |
627 | } |
628 | ||
629 | target_detach (NULL, 0); | |
630 | } | |
d83ad864 DB |
631 | |
632 | /* Note that the detach above makes PARENT_INF dangling. */ | |
633 | ||
634 | /* Add the child thread to the appropriate lists, and switch to | |
635 | this new thread, before cloning the program space, and | |
636 | informing the solib layer about this new process. */ | |
637 | ||
79639e11 | 638 | inferior_ptid = child_ptid; |
d83ad864 DB |
639 | add_thread (inferior_ptid); |
640 | ||
641 | /* If this is a vfork child, then the address-space is shared | |
642 | with the parent. If we detached from the parent, then we can | |
643 | reuse the parent's program/address spaces. */ | |
644 | if (has_vforked || detach_fork) | |
645 | { | |
646 | child_inf->pspace = parent_pspace; | |
647 | child_inf->aspace = child_inf->pspace->aspace; | |
648 | } | |
649 | else | |
650 | { | |
651 | child_inf->aspace = new_address_space (); | |
652 | child_inf->pspace = add_program_space (child_inf->aspace); | |
653 | child_inf->removable = 1; | |
654 | child_inf->symfile_flags = SYMFILE_NO_READ; | |
655 | set_current_program_space (child_inf->pspace); | |
656 | clone_program_space (child_inf->pspace, parent_pspace); | |
657 | ||
658 | /* Let the shared library layer (e.g., solib-svr4) learn | |
659 | about this new process, relocate the cloned exec, pull in | |
660 | shared libraries, and install the solib event breakpoint. | |
661 | If a "cloned-VM" event was propagated better throughout | |
662 | the core, this wouldn't be required. */ | |
663 | solib_create_inferior_hook (0); | |
664 | } | |
665 | } | |
666 | ||
667 | return target_follow_fork (follow_child, detach_fork); | |
668 | } | |
669 | ||
e58b0e63 PA |
670 | /* Tell the target to follow the fork we're stopped at. Returns true |
671 | if the inferior should be resumed; false, if the target for some | |
672 | reason decided it's best not to resume. */ | |
673 | ||
6604731b | 674 | static int |
4ef3f3be | 675 | follow_fork (void) |
c906108c | 676 | { |
ea1dd7bc | 677 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 PA |
678 | int should_resume = 1; |
679 | struct thread_info *tp; | |
680 | ||
681 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
682 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
683 | parent thread structure's run control related fields, not just these. |
684 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
685 | struct breakpoint *step_resume_breakpoint = NULL; | |
186c406b | 686 | struct breakpoint *exception_resume_breakpoint = NULL; |
4e3990f4 DE |
687 | CORE_ADDR step_range_start = 0; |
688 | CORE_ADDR step_range_end = 0; | |
689 | struct frame_id step_frame_id = { 0 }; | |
17b2616c | 690 | struct interp *command_interp = NULL; |
e58b0e63 PA |
691 | |
692 | if (!non_stop) | |
693 | { | |
694 | ptid_t wait_ptid; | |
695 | struct target_waitstatus wait_status; | |
696 | ||
697 | /* Get the last target status returned by target_wait(). */ | |
698 | get_last_target_status (&wait_ptid, &wait_status); | |
699 | ||
700 | /* If not stopped at a fork event, then there's nothing else to | |
701 | do. */ | |
702 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
703 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
704 | return 1; | |
705 | ||
706 | /* Check if we switched over from WAIT_PTID, since the event was | |
707 | reported. */ | |
708 | if (!ptid_equal (wait_ptid, minus_one_ptid) | |
709 | && !ptid_equal (inferior_ptid, wait_ptid)) | |
710 | { | |
711 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
712 | target to follow it (in either direction). We'll | |
713 | afterwards refuse to resume, and inform the user what | |
714 | happened. */ | |
715 | switch_to_thread (wait_ptid); | |
716 | should_resume = 0; | |
717 | } | |
718 | } | |
719 | ||
720 | tp = inferior_thread (); | |
721 | ||
722 | /* If there were any forks/vforks that were caught and are now to be | |
723 | followed, then do so now. */ | |
724 | switch (tp->pending_follow.kind) | |
725 | { | |
726 | case TARGET_WAITKIND_FORKED: | |
727 | case TARGET_WAITKIND_VFORKED: | |
728 | { | |
729 | ptid_t parent, child; | |
730 | ||
731 | /* If the user did a next/step, etc, over a fork call, | |
732 | preserve the stepping state in the fork child. */ | |
733 | if (follow_child && should_resume) | |
734 | { | |
8358c15c JK |
735 | step_resume_breakpoint = clone_momentary_breakpoint |
736 | (tp->control.step_resume_breakpoint); | |
16c381f0 JK |
737 | step_range_start = tp->control.step_range_start; |
738 | step_range_end = tp->control.step_range_end; | |
739 | step_frame_id = tp->control.step_frame_id; | |
186c406b TT |
740 | exception_resume_breakpoint |
741 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
17b2616c | 742 | command_interp = tp->control.command_interp; |
e58b0e63 PA |
743 | |
744 | /* For now, delete the parent's sr breakpoint, otherwise, | |
745 | parent/child sr breakpoints are considered duplicates, | |
746 | and the child version will not be installed. Remove | |
747 | this when the breakpoints module becomes aware of | |
748 | inferiors and address spaces. */ | |
749 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
750 | tp->control.step_range_start = 0; |
751 | tp->control.step_range_end = 0; | |
752 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 753 | delete_exception_resume_breakpoint (tp); |
17b2616c | 754 | tp->control.command_interp = NULL; |
e58b0e63 PA |
755 | } |
756 | ||
757 | parent = inferior_ptid; | |
758 | child = tp->pending_follow.value.related_pid; | |
759 | ||
d83ad864 DB |
760 | /* Set up inferior(s) as specified by the caller, and tell the |
761 | target to do whatever is necessary to follow either parent | |
762 | or child. */ | |
763 | if (follow_fork_inferior (follow_child, detach_fork)) | |
e58b0e63 PA |
764 | { |
765 | /* Target refused to follow, or there's some other reason | |
766 | we shouldn't resume. */ | |
767 | should_resume = 0; | |
768 | } | |
769 | else | |
770 | { | |
771 | /* This pending follow fork event is now handled, one way | |
772 | or another. The previous selected thread may be gone | |
773 | from the lists by now, but if it is still around, need | |
774 | to clear the pending follow request. */ | |
e09875d4 | 775 | tp = find_thread_ptid (parent); |
e58b0e63 PA |
776 | if (tp) |
777 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
778 | ||
779 | /* This makes sure we don't try to apply the "Switched | |
780 | over from WAIT_PID" logic above. */ | |
781 | nullify_last_target_wait_ptid (); | |
782 | ||
1777feb0 | 783 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
784 | if (follow_child) |
785 | { | |
786 | switch_to_thread (child); | |
787 | ||
788 | /* ... and preserve the stepping state, in case the | |
789 | user was stepping over the fork call. */ | |
790 | if (should_resume) | |
791 | { | |
792 | tp = inferior_thread (); | |
8358c15c JK |
793 | tp->control.step_resume_breakpoint |
794 | = step_resume_breakpoint; | |
16c381f0 JK |
795 | tp->control.step_range_start = step_range_start; |
796 | tp->control.step_range_end = step_range_end; | |
797 | tp->control.step_frame_id = step_frame_id; | |
186c406b TT |
798 | tp->control.exception_resume_breakpoint |
799 | = exception_resume_breakpoint; | |
17b2616c | 800 | tp->control.command_interp = command_interp; |
e58b0e63 PA |
801 | } |
802 | else | |
803 | { | |
804 | /* If we get here, it was because we're trying to | |
805 | resume from a fork catchpoint, but, the user | |
806 | has switched threads away from the thread that | |
807 | forked. In that case, the resume command | |
808 | issued is most likely not applicable to the | |
809 | child, so just warn, and refuse to resume. */ | |
3e43a32a | 810 | warning (_("Not resuming: switched threads " |
fd7dcb94 | 811 | "before following fork child.")); |
e58b0e63 PA |
812 | } |
813 | ||
814 | /* Reset breakpoints in the child as appropriate. */ | |
815 | follow_inferior_reset_breakpoints (); | |
816 | } | |
817 | else | |
818 | switch_to_thread (parent); | |
819 | } | |
820 | } | |
821 | break; | |
822 | case TARGET_WAITKIND_SPURIOUS: | |
823 | /* Nothing to follow. */ | |
824 | break; | |
825 | default: | |
826 | internal_error (__FILE__, __LINE__, | |
827 | "Unexpected pending_follow.kind %d\n", | |
828 | tp->pending_follow.kind); | |
829 | break; | |
830 | } | |
c906108c | 831 | |
e58b0e63 | 832 | return should_resume; |
c906108c SS |
833 | } |
834 | ||
d83ad864 | 835 | static void |
6604731b | 836 | follow_inferior_reset_breakpoints (void) |
c906108c | 837 | { |
4e1c45ea PA |
838 | struct thread_info *tp = inferior_thread (); |
839 | ||
6604731b DJ |
840 | /* Was there a step_resume breakpoint? (There was if the user |
841 | did a "next" at the fork() call.) If so, explicitly reset its | |
a1aa2221 LM |
842 | thread number. Cloned step_resume breakpoints are disabled on |
843 | creation, so enable it here now that it is associated with the | |
844 | correct thread. | |
6604731b DJ |
845 | |
846 | step_resumes are a form of bp that are made to be per-thread. | |
847 | Since we created the step_resume bp when the parent process | |
848 | was being debugged, and now are switching to the child process, | |
849 | from the breakpoint package's viewpoint, that's a switch of | |
850 | "threads". We must update the bp's notion of which thread | |
851 | it is for, or it'll be ignored when it triggers. */ | |
852 | ||
8358c15c | 853 | if (tp->control.step_resume_breakpoint) |
a1aa2221 LM |
854 | { |
855 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
856 | tp->control.step_resume_breakpoint->loc->enabled = 1; | |
857 | } | |
6604731b | 858 | |
a1aa2221 | 859 | /* Treat exception_resume breakpoints like step_resume breakpoints. */ |
186c406b | 860 | if (tp->control.exception_resume_breakpoint) |
a1aa2221 LM |
861 | { |
862 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
863 | tp->control.exception_resume_breakpoint->loc->enabled = 1; | |
864 | } | |
186c406b | 865 | |
6604731b DJ |
866 | /* Reinsert all breakpoints in the child. The user may have set |
867 | breakpoints after catching the fork, in which case those | |
868 | were never set in the child, but only in the parent. This makes | |
869 | sure the inserted breakpoints match the breakpoint list. */ | |
870 | ||
871 | breakpoint_re_set (); | |
872 | insert_breakpoints (); | |
c906108c | 873 | } |
c906108c | 874 | |
6c95b8df PA |
875 | /* The child has exited or execed: resume threads of the parent the |
876 | user wanted to be executing. */ | |
877 | ||
878 | static int | |
879 | proceed_after_vfork_done (struct thread_info *thread, | |
880 | void *arg) | |
881 | { | |
882 | int pid = * (int *) arg; | |
883 | ||
884 | if (ptid_get_pid (thread->ptid) == pid | |
885 | && is_running (thread->ptid) | |
886 | && !is_executing (thread->ptid) | |
887 | && !thread->stop_requested | |
a493e3e2 | 888 | && thread->suspend.stop_signal == GDB_SIGNAL_0) |
6c95b8df PA |
889 | { |
890 | if (debug_infrun) | |
891 | fprintf_unfiltered (gdb_stdlog, | |
892 | "infrun: resuming vfork parent thread %s\n", | |
893 | target_pid_to_str (thread->ptid)); | |
894 | ||
895 | switch_to_thread (thread->ptid); | |
70509625 | 896 | clear_proceed_status (0); |
64ce06e4 | 897 | proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT); |
6c95b8df PA |
898 | } |
899 | ||
900 | return 0; | |
901 | } | |
902 | ||
903 | /* Called whenever we notice an exec or exit event, to handle | |
904 | detaching or resuming a vfork parent. */ | |
905 | ||
906 | static void | |
907 | handle_vfork_child_exec_or_exit (int exec) | |
908 | { | |
909 | struct inferior *inf = current_inferior (); | |
910 | ||
911 | if (inf->vfork_parent) | |
912 | { | |
913 | int resume_parent = -1; | |
914 | ||
915 | /* This exec or exit marks the end of the shared memory region | |
916 | between the parent and the child. If the user wanted to | |
917 | detach from the parent, now is the time. */ | |
918 | ||
919 | if (inf->vfork_parent->pending_detach) | |
920 | { | |
921 | struct thread_info *tp; | |
922 | struct cleanup *old_chain; | |
923 | struct program_space *pspace; | |
924 | struct address_space *aspace; | |
925 | ||
1777feb0 | 926 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df | 927 | |
68c9da30 PA |
928 | inf->vfork_parent->pending_detach = 0; |
929 | ||
f50f4e56 PA |
930 | if (!exec) |
931 | { | |
932 | /* If we're handling a child exit, then inferior_ptid | |
933 | points at the inferior's pid, not to a thread. */ | |
934 | old_chain = save_inferior_ptid (); | |
935 | save_current_program_space (); | |
936 | save_current_inferior (); | |
937 | } | |
938 | else | |
939 | old_chain = save_current_space_and_thread (); | |
6c95b8df PA |
940 | |
941 | /* We're letting loose of the parent. */ | |
942 | tp = any_live_thread_of_process (inf->vfork_parent->pid); | |
943 | switch_to_thread (tp->ptid); | |
944 | ||
945 | /* We're about to detach from the parent, which implicitly | |
946 | removes breakpoints from its address space. There's a | |
947 | catch here: we want to reuse the spaces for the child, | |
948 | but, parent/child are still sharing the pspace at this | |
949 | point, although the exec in reality makes the kernel give | |
950 | the child a fresh set of new pages. The problem here is | |
951 | that the breakpoints module being unaware of this, would | |
952 | likely chose the child process to write to the parent | |
953 | address space. Swapping the child temporarily away from | |
954 | the spaces has the desired effect. Yes, this is "sort | |
955 | of" a hack. */ | |
956 | ||
957 | pspace = inf->pspace; | |
958 | aspace = inf->aspace; | |
959 | inf->aspace = NULL; | |
960 | inf->pspace = NULL; | |
961 | ||
962 | if (debug_infrun || info_verbose) | |
963 | { | |
6f259a23 | 964 | target_terminal_ours_for_output (); |
6c95b8df PA |
965 | |
966 | if (exec) | |
6f259a23 DB |
967 | { |
968 | fprintf_filtered (gdb_stdlog, | |
969 | _("Detaching vfork parent process " | |
970 | "%d after child exec.\n"), | |
971 | inf->vfork_parent->pid); | |
972 | } | |
6c95b8df | 973 | else |
6f259a23 DB |
974 | { |
975 | fprintf_filtered (gdb_stdlog, | |
976 | _("Detaching vfork parent process " | |
977 | "%d after child exit.\n"), | |
978 | inf->vfork_parent->pid); | |
979 | } | |
6c95b8df PA |
980 | } |
981 | ||
982 | target_detach (NULL, 0); | |
983 | ||
984 | /* Put it back. */ | |
985 | inf->pspace = pspace; | |
986 | inf->aspace = aspace; | |
987 | ||
988 | do_cleanups (old_chain); | |
989 | } | |
990 | else if (exec) | |
991 | { | |
992 | /* We're staying attached to the parent, so, really give the | |
993 | child a new address space. */ | |
994 | inf->pspace = add_program_space (maybe_new_address_space ()); | |
995 | inf->aspace = inf->pspace->aspace; | |
996 | inf->removable = 1; | |
997 | set_current_program_space (inf->pspace); | |
998 | ||
999 | resume_parent = inf->vfork_parent->pid; | |
1000 | ||
1001 | /* Break the bonds. */ | |
1002 | inf->vfork_parent->vfork_child = NULL; | |
1003 | } | |
1004 | else | |
1005 | { | |
1006 | struct cleanup *old_chain; | |
1007 | struct program_space *pspace; | |
1008 | ||
1009 | /* If this is a vfork child exiting, then the pspace and | |
1010 | aspaces were shared with the parent. Since we're | |
1011 | reporting the process exit, we'll be mourning all that is | |
1012 | found in the address space, and switching to null_ptid, | |
1013 | preparing to start a new inferior. But, since we don't | |
1014 | want to clobber the parent's address/program spaces, we | |
1015 | go ahead and create a new one for this exiting | |
1016 | inferior. */ | |
1017 | ||
1018 | /* Switch to null_ptid, so that clone_program_space doesn't want | |
1019 | to read the selected frame of a dead process. */ | |
1020 | old_chain = save_inferior_ptid (); | |
1021 | inferior_ptid = null_ptid; | |
1022 | ||
1023 | /* This inferior is dead, so avoid giving the breakpoints | |
1024 | module the option to write through to it (cloning a | |
1025 | program space resets breakpoints). */ | |
1026 | inf->aspace = NULL; | |
1027 | inf->pspace = NULL; | |
1028 | pspace = add_program_space (maybe_new_address_space ()); | |
1029 | set_current_program_space (pspace); | |
1030 | inf->removable = 1; | |
7dcd53a0 | 1031 | inf->symfile_flags = SYMFILE_NO_READ; |
6c95b8df PA |
1032 | clone_program_space (pspace, inf->vfork_parent->pspace); |
1033 | inf->pspace = pspace; | |
1034 | inf->aspace = pspace->aspace; | |
1035 | ||
1036 | /* Put back inferior_ptid. We'll continue mourning this | |
1777feb0 | 1037 | inferior. */ |
6c95b8df PA |
1038 | do_cleanups (old_chain); |
1039 | ||
1040 | resume_parent = inf->vfork_parent->pid; | |
1041 | /* Break the bonds. */ | |
1042 | inf->vfork_parent->vfork_child = NULL; | |
1043 | } | |
1044 | ||
1045 | inf->vfork_parent = NULL; | |
1046 | ||
1047 | gdb_assert (current_program_space == inf->pspace); | |
1048 | ||
1049 | if (non_stop && resume_parent != -1) | |
1050 | { | |
1051 | /* If the user wanted the parent to be running, let it go | |
1052 | free now. */ | |
1053 | struct cleanup *old_chain = make_cleanup_restore_current_thread (); | |
1054 | ||
1055 | if (debug_infrun) | |
3e43a32a MS |
1056 | fprintf_unfiltered (gdb_stdlog, |
1057 | "infrun: resuming vfork parent process %d\n", | |
6c95b8df PA |
1058 | resume_parent); |
1059 | ||
1060 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
1061 | ||
1062 | do_cleanups (old_chain); | |
1063 | } | |
1064 | } | |
1065 | } | |
1066 | ||
eb6c553b | 1067 | /* Enum strings for "set|show follow-exec-mode". */ |
6c95b8df PA |
1068 | |
1069 | static const char follow_exec_mode_new[] = "new"; | |
1070 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 1071 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
1072 | { |
1073 | follow_exec_mode_new, | |
1074 | follow_exec_mode_same, | |
1075 | NULL, | |
1076 | }; | |
1077 | ||
1078 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
1079 | static void | |
1080 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
1081 | struct cmd_list_element *c, const char *value) | |
1082 | { | |
1083 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
1084 | } | |
1085 | ||
1777feb0 | 1086 | /* EXECD_PATHNAME is assumed to be non-NULL. */ |
1adeb98a | 1087 | |
c906108c | 1088 | static void |
95e50b27 | 1089 | follow_exec (ptid_t ptid, char *execd_pathname) |
c906108c | 1090 | { |
95e50b27 | 1091 | struct thread_info *th, *tmp; |
6c95b8df | 1092 | struct inferior *inf = current_inferior (); |
95e50b27 | 1093 | int pid = ptid_get_pid (ptid); |
94585166 | 1094 | ptid_t process_ptid; |
7a292a7a | 1095 | |
c906108c SS |
1096 | /* This is an exec event that we actually wish to pay attention to. |
1097 | Refresh our symbol table to the newly exec'd program, remove any | |
1098 | momentary bp's, etc. | |
1099 | ||
1100 | If there are breakpoints, they aren't really inserted now, | |
1101 | since the exec() transformed our inferior into a fresh set | |
1102 | of instructions. | |
1103 | ||
1104 | We want to preserve symbolic breakpoints on the list, since | |
1105 | we have hopes that they can be reset after the new a.out's | |
1106 | symbol table is read. | |
1107 | ||
1108 | However, any "raw" breakpoints must be removed from the list | |
1109 | (e.g., the solib bp's), since their address is probably invalid | |
1110 | now. | |
1111 | ||
1112 | And, we DON'T want to call delete_breakpoints() here, since | |
1113 | that may write the bp's "shadow contents" (the instruction | |
1114 | value that was overwritten witha TRAP instruction). Since | |
1777feb0 | 1115 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
1116 | |
1117 | mark_breakpoints_out (); | |
1118 | ||
95e50b27 PA |
1119 | /* The target reports the exec event to the main thread, even if |
1120 | some other thread does the exec, and even if the main thread was | |
1121 | stopped or already gone. We may still have non-leader threads of | |
1122 | the process on our list. E.g., on targets that don't have thread | |
1123 | exit events (like remote); or on native Linux in non-stop mode if | |
1124 | there were only two threads in the inferior and the non-leader | |
1125 | one is the one that execs (and nothing forces an update of the | |
1126 | thread list up to here). When debugging remotely, it's best to | |
1127 | avoid extra traffic, when possible, so avoid syncing the thread | |
1128 | list with the target, and instead go ahead and delete all threads | |
1129 | of the process but one that reported the event. Note this must | |
1130 | be done before calling update_breakpoints_after_exec, as | |
1131 | otherwise clearing the threads' resources would reference stale | |
1132 | thread breakpoints -- it may have been one of these threads that | |
1133 | stepped across the exec. We could just clear their stepping | |
1134 | states, but as long as we're iterating, might as well delete | |
1135 | them. Deleting them now rather than at the next user-visible | |
1136 | stop provides a nicer sequence of events for user and MI | |
1137 | notifications. */ | |
8a06aea7 | 1138 | ALL_THREADS_SAFE (th, tmp) |
95e50b27 PA |
1139 | if (ptid_get_pid (th->ptid) == pid && !ptid_equal (th->ptid, ptid)) |
1140 | delete_thread (th->ptid); | |
1141 | ||
1142 | /* We also need to clear any left over stale state for the | |
1143 | leader/event thread. E.g., if there was any step-resume | |
1144 | breakpoint or similar, it's gone now. We cannot truly | |
1145 | step-to-next statement through an exec(). */ | |
1146 | th = inferior_thread (); | |
8358c15c | 1147 | th->control.step_resume_breakpoint = NULL; |
186c406b | 1148 | th->control.exception_resume_breakpoint = NULL; |
34b7e8a6 | 1149 | th->control.single_step_breakpoints = NULL; |
16c381f0 JK |
1150 | th->control.step_range_start = 0; |
1151 | th->control.step_range_end = 0; | |
c906108c | 1152 | |
95e50b27 PA |
1153 | /* The user may have had the main thread held stopped in the |
1154 | previous image (e.g., schedlock on, or non-stop). Release | |
1155 | it now. */ | |
a75724bc PA |
1156 | th->stop_requested = 0; |
1157 | ||
95e50b27 PA |
1158 | update_breakpoints_after_exec (); |
1159 | ||
1777feb0 | 1160 | /* What is this a.out's name? */ |
94585166 | 1161 | process_ptid = pid_to_ptid (pid); |
6c95b8df | 1162 | printf_unfiltered (_("%s is executing new program: %s\n"), |
94585166 | 1163 | target_pid_to_str (process_ptid), |
6c95b8df | 1164 | execd_pathname); |
c906108c SS |
1165 | |
1166 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 1167 | inferior has essentially been killed & reborn. */ |
7a292a7a | 1168 | |
c906108c | 1169 | gdb_flush (gdb_stdout); |
6ca15a4b PA |
1170 | |
1171 | breakpoint_init_inferior (inf_execd); | |
e85a822c | 1172 | |
a3be80c3 | 1173 | if (*gdb_sysroot != '\0') |
e85a822c | 1174 | { |
998d2a3e | 1175 | char *name = exec_file_find (execd_pathname, NULL); |
ff862be4 | 1176 | |
224c3ddb | 1177 | execd_pathname = (char *) alloca (strlen (name) + 1); |
ff862be4 GB |
1178 | strcpy (execd_pathname, name); |
1179 | xfree (name); | |
e85a822c | 1180 | } |
c906108c | 1181 | |
cce9b6bf PA |
1182 | /* Reset the shared library package. This ensures that we get a |
1183 | shlib event when the child reaches "_start", at which point the | |
1184 | dld will have had a chance to initialize the child. */ | |
1185 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
1186 | we don't want those to be satisfied by the libraries of the | |
1187 | previous incarnation of this process. */ | |
1188 | no_shared_libraries (NULL, 0); | |
1189 | ||
6c95b8df PA |
1190 | if (follow_exec_mode_string == follow_exec_mode_new) |
1191 | { | |
6c95b8df PA |
1192 | /* The user wants to keep the old inferior and program spaces |
1193 | around. Create a new fresh one, and switch to it. */ | |
1194 | ||
17d8546e DB |
1195 | /* Do exit processing for the original inferior before adding |
1196 | the new inferior so we don't have two active inferiors with | |
1197 | the same ptid, which can confuse find_inferior_ptid. */ | |
1198 | exit_inferior_num_silent (current_inferior ()->num); | |
1199 | ||
94585166 DB |
1200 | inf = add_inferior_with_spaces (); |
1201 | inf->pid = pid; | |
1202 | target_follow_exec (inf, execd_pathname); | |
6c95b8df PA |
1203 | |
1204 | set_current_inferior (inf); | |
94585166 DB |
1205 | set_current_program_space (inf->pspace); |
1206 | add_thread (ptid); | |
6c95b8df | 1207 | } |
9107fc8d PA |
1208 | else |
1209 | { | |
1210 | /* The old description may no longer be fit for the new image. | |
1211 | E.g, a 64-bit process exec'ed a 32-bit process. Clear the | |
1212 | old description; we'll read a new one below. No need to do | |
1213 | this on "follow-exec-mode new", as the old inferior stays | |
1214 | around (its description is later cleared/refetched on | |
1215 | restart). */ | |
1216 | target_clear_description (); | |
1217 | } | |
6c95b8df PA |
1218 | |
1219 | gdb_assert (current_program_space == inf->pspace); | |
1220 | ||
1777feb0 | 1221 | /* That a.out is now the one to use. */ |
6c95b8df PA |
1222 | exec_file_attach (execd_pathname, 0); |
1223 | ||
c1e56572 JK |
1224 | /* SYMFILE_DEFER_BP_RESET is used as the proper displacement for PIE |
1225 | (Position Independent Executable) main symbol file will get applied by | |
1226 | solib_create_inferior_hook below. breakpoint_re_set would fail to insert | |
1227 | the breakpoints with the zero displacement. */ | |
1228 | ||
7dcd53a0 TT |
1229 | symbol_file_add (execd_pathname, |
1230 | (inf->symfile_flags | |
1231 | | SYMFILE_MAINLINE | SYMFILE_DEFER_BP_RESET), | |
c1e56572 JK |
1232 | NULL, 0); |
1233 | ||
7dcd53a0 TT |
1234 | if ((inf->symfile_flags & SYMFILE_NO_READ) == 0) |
1235 | set_initial_language (); | |
c906108c | 1236 | |
9107fc8d PA |
1237 | /* If the target can specify a description, read it. Must do this |
1238 | after flipping to the new executable (because the target supplied | |
1239 | description must be compatible with the executable's | |
1240 | architecture, and the old executable may e.g., be 32-bit, while | |
1241 | the new one 64-bit), and before anything involving memory or | |
1242 | registers. */ | |
1243 | target_find_description (); | |
1244 | ||
268a4a75 | 1245 | solib_create_inferior_hook (0); |
c906108c | 1246 | |
4efc6507 DE |
1247 | jit_inferior_created_hook (); |
1248 | ||
c1e56572 JK |
1249 | breakpoint_re_set (); |
1250 | ||
c906108c SS |
1251 | /* Reinsert all breakpoints. (Those which were symbolic have |
1252 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 1253 | to symbol_file_command...). */ |
c906108c SS |
1254 | insert_breakpoints (); |
1255 | ||
1256 | /* The next resume of this inferior should bring it to the shlib | |
1257 | startup breakpoints. (If the user had also set bp's on | |
1258 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 1259 | matically get reset there in the new process.). */ |
c906108c SS |
1260 | } |
1261 | ||
c2829269 PA |
1262 | /* The queue of threads that need to do a step-over operation to get |
1263 | past e.g., a breakpoint. What technique is used to step over the | |
1264 | breakpoint/watchpoint does not matter -- all threads end up in the | |
1265 | same queue, to maintain rough temporal order of execution, in order | |
1266 | to avoid starvation, otherwise, we could e.g., find ourselves | |
1267 | constantly stepping the same couple threads past their breakpoints | |
1268 | over and over, if the single-step finish fast enough. */ | |
1269 | struct thread_info *step_over_queue_head; | |
1270 | ||
6c4cfb24 PA |
1271 | /* Bit flags indicating what the thread needs to step over. */ |
1272 | ||
8d297bbf | 1273 | enum step_over_what_flag |
6c4cfb24 PA |
1274 | { |
1275 | /* Step over a breakpoint. */ | |
1276 | STEP_OVER_BREAKPOINT = 1, | |
1277 | ||
1278 | /* Step past a non-continuable watchpoint, in order to let the | |
1279 | instruction execute so we can evaluate the watchpoint | |
1280 | expression. */ | |
1281 | STEP_OVER_WATCHPOINT = 2 | |
1282 | }; | |
8d297bbf | 1283 | DEF_ENUM_FLAGS_TYPE (enum step_over_what_flag, step_over_what); |
6c4cfb24 | 1284 | |
963f9c80 | 1285 | /* Info about an instruction that is being stepped over. */ |
31e77af2 PA |
1286 | |
1287 | struct step_over_info | |
1288 | { | |
963f9c80 PA |
1289 | /* If we're stepping past a breakpoint, this is the address space |
1290 | and address of the instruction the breakpoint is set at. We'll | |
1291 | skip inserting all breakpoints here. Valid iff ASPACE is | |
1292 | non-NULL. */ | |
31e77af2 | 1293 | struct address_space *aspace; |
31e77af2 | 1294 | CORE_ADDR address; |
963f9c80 PA |
1295 | |
1296 | /* The instruction being stepped over triggers a nonsteppable | |
1297 | watchpoint. If true, we'll skip inserting watchpoints. */ | |
1298 | int nonsteppable_watchpoint_p; | |
31e77af2 PA |
1299 | }; |
1300 | ||
1301 | /* The step-over info of the location that is being stepped over. | |
1302 | ||
1303 | Note that with async/breakpoint always-inserted mode, a user might | |
1304 | set a new breakpoint/watchpoint/etc. exactly while a breakpoint is | |
1305 | being stepped over. As setting a new breakpoint inserts all | |
1306 | breakpoints, we need to make sure the breakpoint being stepped over | |
1307 | isn't inserted then. We do that by only clearing the step-over | |
1308 | info when the step-over is actually finished (or aborted). | |
1309 | ||
1310 | Presently GDB can only step over one breakpoint at any given time. | |
1311 | Given threads that can't run code in the same address space as the | |
1312 | breakpoint's can't really miss the breakpoint, GDB could be taught | |
1313 | to step-over at most one breakpoint per address space (so this info | |
1314 | could move to the address space object if/when GDB is extended). | |
1315 | The set of breakpoints being stepped over will normally be much | |
1316 | smaller than the set of all breakpoints, so a flag in the | |
1317 | breakpoint location structure would be wasteful. A separate list | |
1318 | also saves complexity and run-time, as otherwise we'd have to go | |
1319 | through all breakpoint locations clearing their flag whenever we | |
1320 | start a new sequence. Similar considerations weigh against storing | |
1321 | this info in the thread object. Plus, not all step overs actually | |
1322 | have breakpoint locations -- e.g., stepping past a single-step | |
1323 | breakpoint, or stepping to complete a non-continuable | |
1324 | watchpoint. */ | |
1325 | static struct step_over_info step_over_info; | |
1326 | ||
1327 | /* Record the address of the breakpoint/instruction we're currently | |
1328 | stepping over. */ | |
1329 | ||
1330 | static void | |
963f9c80 PA |
1331 | set_step_over_info (struct address_space *aspace, CORE_ADDR address, |
1332 | int nonsteppable_watchpoint_p) | |
31e77af2 PA |
1333 | { |
1334 | step_over_info.aspace = aspace; | |
1335 | step_over_info.address = address; | |
963f9c80 | 1336 | step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p; |
31e77af2 PA |
1337 | } |
1338 | ||
1339 | /* Called when we're not longer stepping over a breakpoint / an | |
1340 | instruction, so all breakpoints are free to be (re)inserted. */ | |
1341 | ||
1342 | static void | |
1343 | clear_step_over_info (void) | |
1344 | { | |
372316f1 PA |
1345 | if (debug_infrun) |
1346 | fprintf_unfiltered (gdb_stdlog, | |
1347 | "infrun: clear_step_over_info\n"); | |
31e77af2 PA |
1348 | step_over_info.aspace = NULL; |
1349 | step_over_info.address = 0; | |
963f9c80 | 1350 | step_over_info.nonsteppable_watchpoint_p = 0; |
31e77af2 PA |
1351 | } |
1352 | ||
7f89fd65 | 1353 | /* See infrun.h. */ |
31e77af2 PA |
1354 | |
1355 | int | |
1356 | stepping_past_instruction_at (struct address_space *aspace, | |
1357 | CORE_ADDR address) | |
1358 | { | |
1359 | return (step_over_info.aspace != NULL | |
1360 | && breakpoint_address_match (aspace, address, | |
1361 | step_over_info.aspace, | |
1362 | step_over_info.address)); | |
1363 | } | |
1364 | ||
963f9c80 PA |
1365 | /* See infrun.h. */ |
1366 | ||
1367 | int | |
1368 | stepping_past_nonsteppable_watchpoint (void) | |
1369 | { | |
1370 | return step_over_info.nonsteppable_watchpoint_p; | |
1371 | } | |
1372 | ||
6cc83d2a PA |
1373 | /* Returns true if step-over info is valid. */ |
1374 | ||
1375 | static int | |
1376 | step_over_info_valid_p (void) | |
1377 | { | |
963f9c80 PA |
1378 | return (step_over_info.aspace != NULL |
1379 | || stepping_past_nonsteppable_watchpoint ()); | |
6cc83d2a PA |
1380 | } |
1381 | ||
c906108c | 1382 | \f |
237fc4c9 PA |
1383 | /* Displaced stepping. */ |
1384 | ||
1385 | /* In non-stop debugging mode, we must take special care to manage | |
1386 | breakpoints properly; in particular, the traditional strategy for | |
1387 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1388 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1389 | breakpoint it has hit while ensuring that other threads running | |
1390 | concurrently will hit the breakpoint as they should. | |
1391 | ||
1392 | The traditional way to step a thread T off a breakpoint in a | |
1393 | multi-threaded program in all-stop mode is as follows: | |
1394 | ||
1395 | a0) Initially, all threads are stopped, and breakpoints are not | |
1396 | inserted. | |
1397 | a1) We single-step T, leaving breakpoints uninserted. | |
1398 | a2) We insert breakpoints, and resume all threads. | |
1399 | ||
1400 | In non-stop debugging, however, this strategy is unsuitable: we | |
1401 | don't want to have to stop all threads in the system in order to | |
1402 | continue or step T past a breakpoint. Instead, we use displaced | |
1403 | stepping: | |
1404 | ||
1405 | n0) Initially, T is stopped, other threads are running, and | |
1406 | breakpoints are inserted. | |
1407 | n1) We copy the instruction "under" the breakpoint to a separate | |
1408 | location, outside the main code stream, making any adjustments | |
1409 | to the instruction, register, and memory state as directed by | |
1410 | T's architecture. | |
1411 | n2) We single-step T over the instruction at its new location. | |
1412 | n3) We adjust the resulting register and memory state as directed | |
1413 | by T's architecture. This includes resetting T's PC to point | |
1414 | back into the main instruction stream. | |
1415 | n4) We resume T. | |
1416 | ||
1417 | This approach depends on the following gdbarch methods: | |
1418 | ||
1419 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1420 | indicate where to copy the instruction, and how much space must | |
1421 | be reserved there. We use these in step n1. | |
1422 | ||
1423 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1424 | address, and makes any necessary adjustments to the instruction, | |
1425 | register contents, and memory. We use this in step n1. | |
1426 | ||
1427 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
1428 | we have successfuly single-stepped the instruction, to yield the | |
1429 | same effect the instruction would have had if we had executed it | |
1430 | at its original address. We use this in step n3. | |
1431 | ||
1432 | - gdbarch_displaced_step_free_closure provides cleanup. | |
1433 | ||
1434 | The gdbarch_displaced_step_copy_insn and | |
1435 | gdbarch_displaced_step_fixup functions must be written so that | |
1436 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1437 | single-stepping across the copied instruction, and then applying | |
1438 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1439 | thread's memory and registers as stepping the instruction in place | |
1440 | would have. Exactly which responsibilities fall to the copy and | |
1441 | which fall to the fixup is up to the author of those functions. | |
1442 | ||
1443 | See the comments in gdbarch.sh for details. | |
1444 | ||
1445 | Note that displaced stepping and software single-step cannot | |
1446 | currently be used in combination, although with some care I think | |
1447 | they could be made to. Software single-step works by placing | |
1448 | breakpoints on all possible subsequent instructions; if the | |
1449 | displaced instruction is a PC-relative jump, those breakpoints | |
1450 | could fall in very strange places --- on pages that aren't | |
1451 | executable, or at addresses that are not proper instruction | |
1452 | boundaries. (We do generally let other threads run while we wait | |
1453 | to hit the software single-step breakpoint, and they might | |
1454 | encounter such a corrupted instruction.) One way to work around | |
1455 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1456 | simulate the effect of PC-relative instructions (and return NULL) | |
1457 | on architectures that use software single-stepping. | |
1458 | ||
1459 | In non-stop mode, we can have independent and simultaneous step | |
1460 | requests, so more than one thread may need to simultaneously step | |
1461 | over a breakpoint. The current implementation assumes there is | |
1462 | only one scratch space per process. In this case, we have to | |
1463 | serialize access to the scratch space. If thread A wants to step | |
1464 | over a breakpoint, but we are currently waiting for some other | |
1465 | thread to complete a displaced step, we leave thread A stopped and | |
1466 | place it in the displaced_step_request_queue. Whenever a displaced | |
1467 | step finishes, we pick the next thread in the queue and start a new | |
1468 | displaced step operation on it. See displaced_step_prepare and | |
1469 | displaced_step_fixup for details. */ | |
1470 | ||
fc1cf338 PA |
1471 | /* Per-inferior displaced stepping state. */ |
1472 | struct displaced_step_inferior_state | |
1473 | { | |
1474 | /* Pointer to next in linked list. */ | |
1475 | struct displaced_step_inferior_state *next; | |
1476 | ||
1477 | /* The process this displaced step state refers to. */ | |
1478 | int pid; | |
1479 | ||
3fc8eb30 PA |
1480 | /* True if preparing a displaced step ever failed. If so, we won't |
1481 | try displaced stepping for this inferior again. */ | |
1482 | int failed_before; | |
1483 | ||
fc1cf338 PA |
1484 | /* If this is not null_ptid, this is the thread carrying out a |
1485 | displaced single-step in process PID. This thread's state will | |
1486 | require fixing up once it has completed its step. */ | |
1487 | ptid_t step_ptid; | |
1488 | ||
1489 | /* The architecture the thread had when we stepped it. */ | |
1490 | struct gdbarch *step_gdbarch; | |
1491 | ||
1492 | /* The closure provided gdbarch_displaced_step_copy_insn, to be used | |
1493 | for post-step cleanup. */ | |
1494 | struct displaced_step_closure *step_closure; | |
1495 | ||
1496 | /* The address of the original instruction, and the copy we | |
1497 | made. */ | |
1498 | CORE_ADDR step_original, step_copy; | |
1499 | ||
1500 | /* Saved contents of copy area. */ | |
1501 | gdb_byte *step_saved_copy; | |
1502 | }; | |
1503 | ||
1504 | /* The list of states of processes involved in displaced stepping | |
1505 | presently. */ | |
1506 | static struct displaced_step_inferior_state *displaced_step_inferior_states; | |
1507 | ||
1508 | /* Get the displaced stepping state of process PID. */ | |
1509 | ||
1510 | static struct displaced_step_inferior_state * | |
1511 | get_displaced_stepping_state (int pid) | |
1512 | { | |
1513 | struct displaced_step_inferior_state *state; | |
1514 | ||
1515 | for (state = displaced_step_inferior_states; | |
1516 | state != NULL; | |
1517 | state = state->next) | |
1518 | if (state->pid == pid) | |
1519 | return state; | |
1520 | ||
1521 | return NULL; | |
1522 | } | |
1523 | ||
372316f1 PA |
1524 | /* Returns true if any inferior has a thread doing a displaced |
1525 | step. */ | |
1526 | ||
1527 | static int | |
1528 | displaced_step_in_progress_any_inferior (void) | |
1529 | { | |
1530 | struct displaced_step_inferior_state *state; | |
1531 | ||
1532 | for (state = displaced_step_inferior_states; | |
1533 | state != NULL; | |
1534 | state = state->next) | |
1535 | if (!ptid_equal (state->step_ptid, null_ptid)) | |
1536 | return 1; | |
1537 | ||
1538 | return 0; | |
1539 | } | |
1540 | ||
c0987663 YQ |
1541 | /* Return true if thread represented by PTID is doing a displaced |
1542 | step. */ | |
1543 | ||
1544 | static int | |
1545 | displaced_step_in_progress_thread (ptid_t ptid) | |
1546 | { | |
1547 | struct displaced_step_inferior_state *displaced; | |
1548 | ||
1549 | gdb_assert (!ptid_equal (ptid, null_ptid)); | |
1550 | ||
1551 | displaced = get_displaced_stepping_state (ptid_get_pid (ptid)); | |
1552 | ||
1553 | return (displaced != NULL && ptid_equal (displaced->step_ptid, ptid)); | |
1554 | } | |
1555 | ||
8f572e5c PA |
1556 | /* Return true if process PID has a thread doing a displaced step. */ |
1557 | ||
1558 | static int | |
1559 | displaced_step_in_progress (int pid) | |
1560 | { | |
1561 | struct displaced_step_inferior_state *displaced; | |
1562 | ||
1563 | displaced = get_displaced_stepping_state (pid); | |
1564 | if (displaced != NULL && !ptid_equal (displaced->step_ptid, null_ptid)) | |
1565 | return 1; | |
1566 | ||
1567 | return 0; | |
1568 | } | |
1569 | ||
fc1cf338 PA |
1570 | /* Add a new displaced stepping state for process PID to the displaced |
1571 | stepping state list, or return a pointer to an already existing | |
1572 | entry, if it already exists. Never returns NULL. */ | |
1573 | ||
1574 | static struct displaced_step_inferior_state * | |
1575 | add_displaced_stepping_state (int pid) | |
1576 | { | |
1577 | struct displaced_step_inferior_state *state; | |
1578 | ||
1579 | for (state = displaced_step_inferior_states; | |
1580 | state != NULL; | |
1581 | state = state->next) | |
1582 | if (state->pid == pid) | |
1583 | return state; | |
237fc4c9 | 1584 | |
8d749320 | 1585 | state = XCNEW (struct displaced_step_inferior_state); |
fc1cf338 PA |
1586 | state->pid = pid; |
1587 | state->next = displaced_step_inferior_states; | |
1588 | displaced_step_inferior_states = state; | |
237fc4c9 | 1589 | |
fc1cf338 PA |
1590 | return state; |
1591 | } | |
1592 | ||
a42244db YQ |
1593 | /* If inferior is in displaced stepping, and ADDR equals to starting address |
1594 | of copy area, return corresponding displaced_step_closure. Otherwise, | |
1595 | return NULL. */ | |
1596 | ||
1597 | struct displaced_step_closure* | |
1598 | get_displaced_step_closure_by_addr (CORE_ADDR addr) | |
1599 | { | |
1600 | struct displaced_step_inferior_state *displaced | |
1601 | = get_displaced_stepping_state (ptid_get_pid (inferior_ptid)); | |
1602 | ||
1603 | /* If checking the mode of displaced instruction in copy area. */ | |
1604 | if (displaced && !ptid_equal (displaced->step_ptid, null_ptid) | |
1605 | && (displaced->step_copy == addr)) | |
1606 | return displaced->step_closure; | |
1607 | ||
1608 | return NULL; | |
1609 | } | |
1610 | ||
fc1cf338 | 1611 | /* Remove the displaced stepping state of process PID. */ |
237fc4c9 | 1612 | |
fc1cf338 PA |
1613 | static void |
1614 | remove_displaced_stepping_state (int pid) | |
1615 | { | |
1616 | struct displaced_step_inferior_state *it, **prev_next_p; | |
237fc4c9 | 1617 | |
fc1cf338 PA |
1618 | gdb_assert (pid != 0); |
1619 | ||
1620 | it = displaced_step_inferior_states; | |
1621 | prev_next_p = &displaced_step_inferior_states; | |
1622 | while (it) | |
1623 | { | |
1624 | if (it->pid == pid) | |
1625 | { | |
1626 | *prev_next_p = it->next; | |
1627 | xfree (it); | |
1628 | return; | |
1629 | } | |
1630 | ||
1631 | prev_next_p = &it->next; | |
1632 | it = *prev_next_p; | |
1633 | } | |
1634 | } | |
1635 | ||
1636 | static void | |
1637 | infrun_inferior_exit (struct inferior *inf) | |
1638 | { | |
1639 | remove_displaced_stepping_state (inf->pid); | |
1640 | } | |
237fc4c9 | 1641 | |
fff08868 HZ |
1642 | /* If ON, and the architecture supports it, GDB will use displaced |
1643 | stepping to step over breakpoints. If OFF, or if the architecture | |
1644 | doesn't support it, GDB will instead use the traditional | |
1645 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1646 | decide which technique to use to step over breakpoints depending on | |
1647 | which of all-stop or non-stop mode is active --- displaced stepping | |
1648 | in non-stop mode; hold-and-step in all-stop mode. */ | |
1649 | ||
72d0e2c5 | 1650 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1651 | |
237fc4c9 PA |
1652 | static void |
1653 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1654 | struct cmd_list_element *c, | |
1655 | const char *value) | |
1656 | { | |
72d0e2c5 | 1657 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
3e43a32a MS |
1658 | fprintf_filtered (file, |
1659 | _("Debugger's willingness to use displaced stepping " | |
1660 | "to step over breakpoints is %s (currently %s).\n"), | |
fbea99ea | 1661 | value, target_is_non_stop_p () ? "on" : "off"); |
fff08868 | 1662 | else |
3e43a32a MS |
1663 | fprintf_filtered (file, |
1664 | _("Debugger's willingness to use displaced stepping " | |
1665 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1666 | } |
1667 | ||
fff08868 | 1668 | /* Return non-zero if displaced stepping can/should be used to step |
3fc8eb30 | 1669 | over breakpoints of thread TP. */ |
fff08868 | 1670 | |
237fc4c9 | 1671 | static int |
3fc8eb30 | 1672 | use_displaced_stepping (struct thread_info *tp) |
237fc4c9 | 1673 | { |
3fc8eb30 PA |
1674 | struct regcache *regcache = get_thread_regcache (tp->ptid); |
1675 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
1676 | struct displaced_step_inferior_state *displaced_state; | |
1677 | ||
1678 | displaced_state = get_displaced_stepping_state (ptid_get_pid (tp->ptid)); | |
1679 | ||
fbea99ea PA |
1680 | return (((can_use_displaced_stepping == AUTO_BOOLEAN_AUTO |
1681 | && target_is_non_stop_p ()) | |
72d0e2c5 | 1682 | || can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) |
96429cc8 | 1683 | && gdbarch_displaced_step_copy_insn_p (gdbarch) |
3fc8eb30 PA |
1684 | && find_record_target () == NULL |
1685 | && (displaced_state == NULL | |
1686 | || !displaced_state->failed_before)); | |
237fc4c9 PA |
1687 | } |
1688 | ||
1689 | /* Clean out any stray displaced stepping state. */ | |
1690 | static void | |
fc1cf338 | 1691 | displaced_step_clear (struct displaced_step_inferior_state *displaced) |
237fc4c9 PA |
1692 | { |
1693 | /* Indicate that there is no cleanup pending. */ | |
fc1cf338 | 1694 | displaced->step_ptid = null_ptid; |
237fc4c9 | 1695 | |
fc1cf338 | 1696 | if (displaced->step_closure) |
237fc4c9 | 1697 | { |
fc1cf338 PA |
1698 | gdbarch_displaced_step_free_closure (displaced->step_gdbarch, |
1699 | displaced->step_closure); | |
1700 | displaced->step_closure = NULL; | |
237fc4c9 PA |
1701 | } |
1702 | } | |
1703 | ||
1704 | static void | |
fc1cf338 | 1705 | displaced_step_clear_cleanup (void *arg) |
237fc4c9 | 1706 | { |
9a3c8263 SM |
1707 | struct displaced_step_inferior_state *state |
1708 | = (struct displaced_step_inferior_state *) arg; | |
fc1cf338 PA |
1709 | |
1710 | displaced_step_clear (state); | |
237fc4c9 PA |
1711 | } |
1712 | ||
1713 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
1714 | void | |
1715 | displaced_step_dump_bytes (struct ui_file *file, | |
1716 | const gdb_byte *buf, | |
1717 | size_t len) | |
1718 | { | |
1719 | int i; | |
1720 | ||
1721 | for (i = 0; i < len; i++) | |
1722 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
1723 | fputs_unfiltered ("\n", file); | |
1724 | } | |
1725 | ||
1726 | /* Prepare to single-step, using displaced stepping. | |
1727 | ||
1728 | Note that we cannot use displaced stepping when we have a signal to | |
1729 | deliver. If we have a signal to deliver and an instruction to step | |
1730 | over, then after the step, there will be no indication from the | |
1731 | target whether the thread entered a signal handler or ignored the | |
1732 | signal and stepped over the instruction successfully --- both cases | |
1733 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1734 | fixup, and in the second case we must --- but we can't tell which. | |
1735 | Comments in the code for 'random signals' in handle_inferior_event | |
1736 | explain how we handle this case instead. | |
1737 | ||
1738 | Returns 1 if preparing was successful -- this thread is going to be | |
7f03bd92 PA |
1739 | stepped now; 0 if displaced stepping this thread got queued; or -1 |
1740 | if this instruction can't be displaced stepped. */ | |
1741 | ||
237fc4c9 | 1742 | static int |
3fc8eb30 | 1743 | displaced_step_prepare_throw (ptid_t ptid) |
237fc4c9 | 1744 | { |
ad53cd71 | 1745 | struct cleanup *old_cleanups, *ignore_cleanups; |
c1e36e3e | 1746 | struct thread_info *tp = find_thread_ptid (ptid); |
237fc4c9 PA |
1747 | struct regcache *regcache = get_thread_regcache (ptid); |
1748 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
d35ae833 | 1749 | struct address_space *aspace = get_regcache_aspace (regcache); |
237fc4c9 PA |
1750 | CORE_ADDR original, copy; |
1751 | ULONGEST len; | |
1752 | struct displaced_step_closure *closure; | |
fc1cf338 | 1753 | struct displaced_step_inferior_state *displaced; |
9e529e1d | 1754 | int status; |
237fc4c9 PA |
1755 | |
1756 | /* We should never reach this function if the architecture does not | |
1757 | support displaced stepping. */ | |
1758 | gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch)); | |
1759 | ||
c2829269 PA |
1760 | /* Nor if the thread isn't meant to step over a breakpoint. */ |
1761 | gdb_assert (tp->control.trap_expected); | |
1762 | ||
c1e36e3e PA |
1763 | /* Disable range stepping while executing in the scratch pad. We |
1764 | want a single-step even if executing the displaced instruction in | |
1765 | the scratch buffer lands within the stepping range (e.g., a | |
1766 | jump/branch). */ | |
1767 | tp->control.may_range_step = 0; | |
1768 | ||
fc1cf338 PA |
1769 | /* We have to displaced step one thread at a time, as we only have |
1770 | access to a single scratch space per inferior. */ | |
237fc4c9 | 1771 | |
fc1cf338 PA |
1772 | displaced = add_displaced_stepping_state (ptid_get_pid (ptid)); |
1773 | ||
1774 | if (!ptid_equal (displaced->step_ptid, null_ptid)) | |
237fc4c9 PA |
1775 | { |
1776 | /* Already waiting for a displaced step to finish. Defer this | |
1777 | request and place in queue. */ | |
237fc4c9 PA |
1778 | |
1779 | if (debug_displaced) | |
1780 | fprintf_unfiltered (gdb_stdlog, | |
c2829269 | 1781 | "displaced: deferring step of %s\n", |
237fc4c9 PA |
1782 | target_pid_to_str (ptid)); |
1783 | ||
c2829269 | 1784 | thread_step_over_chain_enqueue (tp); |
237fc4c9 PA |
1785 | return 0; |
1786 | } | |
1787 | else | |
1788 | { | |
1789 | if (debug_displaced) | |
1790 | fprintf_unfiltered (gdb_stdlog, | |
1791 | "displaced: stepping %s now\n", | |
1792 | target_pid_to_str (ptid)); | |
1793 | } | |
1794 | ||
fc1cf338 | 1795 | displaced_step_clear (displaced); |
237fc4c9 | 1796 | |
ad53cd71 PA |
1797 | old_cleanups = save_inferior_ptid (); |
1798 | inferior_ptid = ptid; | |
1799 | ||
515630c5 | 1800 | original = regcache_read_pc (regcache); |
237fc4c9 PA |
1801 | |
1802 | copy = gdbarch_displaced_step_location (gdbarch); | |
1803 | len = gdbarch_max_insn_length (gdbarch); | |
1804 | ||
d35ae833 PA |
1805 | if (breakpoint_in_range_p (aspace, copy, len)) |
1806 | { | |
1807 | /* There's a breakpoint set in the scratch pad location range | |
1808 | (which is usually around the entry point). We'd either | |
1809 | install it before resuming, which would overwrite/corrupt the | |
1810 | scratch pad, or if it was already inserted, this displaced | |
1811 | step would overwrite it. The latter is OK in the sense that | |
1812 | we already assume that no thread is going to execute the code | |
1813 | in the scratch pad range (after initial startup) anyway, but | |
1814 | the former is unacceptable. Simply punt and fallback to | |
1815 | stepping over this breakpoint in-line. */ | |
1816 | if (debug_displaced) | |
1817 | { | |
1818 | fprintf_unfiltered (gdb_stdlog, | |
1819 | "displaced: breakpoint set in scratch pad. " | |
1820 | "Stepping over breakpoint in-line instead.\n"); | |
1821 | } | |
1822 | ||
1823 | do_cleanups (old_cleanups); | |
1824 | return -1; | |
1825 | } | |
1826 | ||
237fc4c9 | 1827 | /* Save the original contents of the copy area. */ |
224c3ddb | 1828 | displaced->step_saved_copy = (gdb_byte *) xmalloc (len); |
ad53cd71 | 1829 | ignore_cleanups = make_cleanup (free_current_contents, |
fc1cf338 | 1830 | &displaced->step_saved_copy); |
9e529e1d JK |
1831 | status = target_read_memory (copy, displaced->step_saved_copy, len); |
1832 | if (status != 0) | |
1833 | throw_error (MEMORY_ERROR, | |
1834 | _("Error accessing memory address %s (%s) for " | |
1835 | "displaced-stepping scratch space."), | |
1836 | paddress (gdbarch, copy), safe_strerror (status)); | |
237fc4c9 PA |
1837 | if (debug_displaced) |
1838 | { | |
5af949e3 UW |
1839 | fprintf_unfiltered (gdb_stdlog, "displaced: saved %s: ", |
1840 | paddress (gdbarch, copy)); | |
fc1cf338 PA |
1841 | displaced_step_dump_bytes (gdb_stdlog, |
1842 | displaced->step_saved_copy, | |
1843 | len); | |
237fc4c9 PA |
1844 | }; |
1845 | ||
1846 | closure = gdbarch_displaced_step_copy_insn (gdbarch, | |
ad53cd71 | 1847 | original, copy, regcache); |
7f03bd92 PA |
1848 | if (closure == NULL) |
1849 | { | |
1850 | /* The architecture doesn't know how or want to displaced step | |
1851 | this instruction or instruction sequence. Fallback to | |
1852 | stepping over the breakpoint in-line. */ | |
1853 | do_cleanups (old_cleanups); | |
1854 | return -1; | |
1855 | } | |
237fc4c9 | 1856 | |
9f5a595d UW |
1857 | /* Save the information we need to fix things up if the step |
1858 | succeeds. */ | |
fc1cf338 PA |
1859 | displaced->step_ptid = ptid; |
1860 | displaced->step_gdbarch = gdbarch; | |
1861 | displaced->step_closure = closure; | |
1862 | displaced->step_original = original; | |
1863 | displaced->step_copy = copy; | |
9f5a595d | 1864 | |
fc1cf338 | 1865 | make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 PA |
1866 | |
1867 | /* Resume execution at the copy. */ | |
515630c5 | 1868 | regcache_write_pc (regcache, copy); |
237fc4c9 | 1869 | |
ad53cd71 PA |
1870 | discard_cleanups (ignore_cleanups); |
1871 | ||
1872 | do_cleanups (old_cleanups); | |
237fc4c9 PA |
1873 | |
1874 | if (debug_displaced) | |
5af949e3 UW |
1875 | fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to %s\n", |
1876 | paddress (gdbarch, copy)); | |
237fc4c9 | 1877 | |
237fc4c9 PA |
1878 | return 1; |
1879 | } | |
1880 | ||
3fc8eb30 PA |
1881 | /* Wrapper for displaced_step_prepare_throw that disabled further |
1882 | attempts at displaced stepping if we get a memory error. */ | |
1883 | ||
1884 | static int | |
1885 | displaced_step_prepare (ptid_t ptid) | |
1886 | { | |
1887 | int prepared = -1; | |
1888 | ||
1889 | TRY | |
1890 | { | |
1891 | prepared = displaced_step_prepare_throw (ptid); | |
1892 | } | |
1893 | CATCH (ex, RETURN_MASK_ERROR) | |
1894 | { | |
1895 | struct displaced_step_inferior_state *displaced_state; | |
1896 | ||
1897 | if (ex.error != MEMORY_ERROR) | |
1898 | throw_exception (ex); | |
1899 | ||
1900 | if (debug_infrun) | |
1901 | { | |
1902 | fprintf_unfiltered (gdb_stdlog, | |
1903 | "infrun: disabling displaced stepping: %s\n", | |
1904 | ex.message); | |
1905 | } | |
1906 | ||
1907 | /* Be verbose if "set displaced-stepping" is "on", silent if | |
1908 | "auto". */ | |
1909 | if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
1910 | { | |
fd7dcb94 | 1911 | warning (_("disabling displaced stepping: %s"), |
3fc8eb30 PA |
1912 | ex.message); |
1913 | } | |
1914 | ||
1915 | /* Disable further displaced stepping attempts. */ | |
1916 | displaced_state | |
1917 | = get_displaced_stepping_state (ptid_get_pid (ptid)); | |
1918 | displaced_state->failed_before = 1; | |
1919 | } | |
1920 | END_CATCH | |
1921 | ||
1922 | return prepared; | |
1923 | } | |
1924 | ||
237fc4c9 | 1925 | static void |
3e43a32a MS |
1926 | write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr, |
1927 | const gdb_byte *myaddr, int len) | |
237fc4c9 PA |
1928 | { |
1929 | struct cleanup *ptid_cleanup = save_inferior_ptid (); | |
abbb1732 | 1930 | |
237fc4c9 PA |
1931 | inferior_ptid = ptid; |
1932 | write_memory (memaddr, myaddr, len); | |
1933 | do_cleanups (ptid_cleanup); | |
1934 | } | |
1935 | ||
e2d96639 YQ |
1936 | /* Restore the contents of the copy area for thread PTID. */ |
1937 | ||
1938 | static void | |
1939 | displaced_step_restore (struct displaced_step_inferior_state *displaced, | |
1940 | ptid_t ptid) | |
1941 | { | |
1942 | ULONGEST len = gdbarch_max_insn_length (displaced->step_gdbarch); | |
1943 | ||
1944 | write_memory_ptid (ptid, displaced->step_copy, | |
1945 | displaced->step_saved_copy, len); | |
1946 | if (debug_displaced) | |
1947 | fprintf_unfiltered (gdb_stdlog, "displaced: restored %s %s\n", | |
1948 | target_pid_to_str (ptid), | |
1949 | paddress (displaced->step_gdbarch, | |
1950 | displaced->step_copy)); | |
1951 | } | |
1952 | ||
372316f1 PA |
1953 | /* If we displaced stepped an instruction successfully, adjust |
1954 | registers and memory to yield the same effect the instruction would | |
1955 | have had if we had executed it at its original address, and return | |
1956 | 1. If the instruction didn't complete, relocate the PC and return | |
1957 | -1. If the thread wasn't displaced stepping, return 0. */ | |
1958 | ||
1959 | static int | |
2ea28649 | 1960 | displaced_step_fixup (ptid_t event_ptid, enum gdb_signal signal) |
237fc4c9 PA |
1961 | { |
1962 | struct cleanup *old_cleanups; | |
fc1cf338 PA |
1963 | struct displaced_step_inferior_state *displaced |
1964 | = get_displaced_stepping_state (ptid_get_pid (event_ptid)); | |
372316f1 | 1965 | int ret; |
fc1cf338 PA |
1966 | |
1967 | /* Was any thread of this process doing a displaced step? */ | |
1968 | if (displaced == NULL) | |
372316f1 | 1969 | return 0; |
237fc4c9 PA |
1970 | |
1971 | /* Was this event for the pid we displaced? */ | |
fc1cf338 PA |
1972 | if (ptid_equal (displaced->step_ptid, null_ptid) |
1973 | || ! ptid_equal (displaced->step_ptid, event_ptid)) | |
372316f1 | 1974 | return 0; |
237fc4c9 | 1975 | |
fc1cf338 | 1976 | old_cleanups = make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 | 1977 | |
e2d96639 | 1978 | displaced_step_restore (displaced, displaced->step_ptid); |
237fc4c9 | 1979 | |
cb71640d PA |
1980 | /* Fixup may need to read memory/registers. Switch to the thread |
1981 | that we're fixing up. Also, target_stopped_by_watchpoint checks | |
1982 | the current thread. */ | |
1983 | switch_to_thread (event_ptid); | |
1984 | ||
237fc4c9 | 1985 | /* Did the instruction complete successfully? */ |
cb71640d PA |
1986 | if (signal == GDB_SIGNAL_TRAP |
1987 | && !(target_stopped_by_watchpoint () | |
1988 | && (gdbarch_have_nonsteppable_watchpoint (displaced->step_gdbarch) | |
1989 | || target_have_steppable_watchpoint))) | |
237fc4c9 PA |
1990 | { |
1991 | /* Fix up the resulting state. */ | |
fc1cf338 PA |
1992 | gdbarch_displaced_step_fixup (displaced->step_gdbarch, |
1993 | displaced->step_closure, | |
1994 | displaced->step_original, | |
1995 | displaced->step_copy, | |
1996 | get_thread_regcache (displaced->step_ptid)); | |
372316f1 | 1997 | ret = 1; |
237fc4c9 PA |
1998 | } |
1999 | else | |
2000 | { | |
2001 | /* Since the instruction didn't complete, all we can do is | |
2002 | relocate the PC. */ | |
515630c5 UW |
2003 | struct regcache *regcache = get_thread_regcache (event_ptid); |
2004 | CORE_ADDR pc = regcache_read_pc (regcache); | |
abbb1732 | 2005 | |
fc1cf338 | 2006 | pc = displaced->step_original + (pc - displaced->step_copy); |
515630c5 | 2007 | regcache_write_pc (regcache, pc); |
372316f1 | 2008 | ret = -1; |
237fc4c9 PA |
2009 | } |
2010 | ||
2011 | do_cleanups (old_cleanups); | |
2012 | ||
fc1cf338 | 2013 | displaced->step_ptid = null_ptid; |
372316f1 PA |
2014 | |
2015 | return ret; | |
c2829269 | 2016 | } |
1c5cfe86 | 2017 | |
4d9d9d04 PA |
2018 | /* Data to be passed around while handling an event. This data is |
2019 | discarded between events. */ | |
2020 | struct execution_control_state | |
2021 | { | |
2022 | ptid_t ptid; | |
2023 | /* The thread that got the event, if this was a thread event; NULL | |
2024 | otherwise. */ | |
2025 | struct thread_info *event_thread; | |
2026 | ||
2027 | struct target_waitstatus ws; | |
2028 | int stop_func_filled_in; | |
2029 | CORE_ADDR stop_func_start; | |
2030 | CORE_ADDR stop_func_end; | |
2031 | const char *stop_func_name; | |
2032 | int wait_some_more; | |
2033 | ||
2034 | /* True if the event thread hit the single-step breakpoint of | |
2035 | another thread. Thus the event doesn't cause a stop, the thread | |
2036 | needs to be single-stepped past the single-step breakpoint before | |
2037 | we can switch back to the original stepping thread. */ | |
2038 | int hit_singlestep_breakpoint; | |
2039 | }; | |
2040 | ||
2041 | /* Clear ECS and set it to point at TP. */ | |
c2829269 PA |
2042 | |
2043 | static void | |
4d9d9d04 PA |
2044 | reset_ecs (struct execution_control_state *ecs, struct thread_info *tp) |
2045 | { | |
2046 | memset (ecs, 0, sizeof (*ecs)); | |
2047 | ecs->event_thread = tp; | |
2048 | ecs->ptid = tp->ptid; | |
2049 | } | |
2050 | ||
2051 | static void keep_going_pass_signal (struct execution_control_state *ecs); | |
2052 | static void prepare_to_wait (struct execution_control_state *ecs); | |
2ac7589c | 2053 | static int keep_going_stepped_thread (struct thread_info *tp); |
8d297bbf | 2054 | static step_over_what thread_still_needs_step_over (struct thread_info *tp); |
3fc8eb30 | 2055 | static void stop_all_threads (void); |
4d9d9d04 PA |
2056 | |
2057 | /* Are there any pending step-over requests? If so, run all we can | |
2058 | now and return true. Otherwise, return false. */ | |
2059 | ||
2060 | static int | |
c2829269 PA |
2061 | start_step_over (void) |
2062 | { | |
2063 | struct thread_info *tp, *next; | |
2064 | ||
372316f1 PA |
2065 | /* Don't start a new step-over if we already have an in-line |
2066 | step-over operation ongoing. */ | |
2067 | if (step_over_info_valid_p ()) | |
2068 | return 0; | |
2069 | ||
c2829269 | 2070 | for (tp = step_over_queue_head; tp != NULL; tp = next) |
237fc4c9 | 2071 | { |
4d9d9d04 PA |
2072 | struct execution_control_state ecss; |
2073 | struct execution_control_state *ecs = &ecss; | |
8d297bbf | 2074 | step_over_what step_what; |
372316f1 | 2075 | int must_be_in_line; |
c2829269 PA |
2076 | |
2077 | next = thread_step_over_chain_next (tp); | |
237fc4c9 | 2078 | |
c2829269 PA |
2079 | /* If this inferior already has a displaced step in process, |
2080 | don't start a new one. */ | |
4d9d9d04 | 2081 | if (displaced_step_in_progress (ptid_get_pid (tp->ptid))) |
c2829269 PA |
2082 | continue; |
2083 | ||
372316f1 PA |
2084 | step_what = thread_still_needs_step_over (tp); |
2085 | must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT) | |
2086 | || ((step_what & STEP_OVER_BREAKPOINT) | |
3fc8eb30 | 2087 | && !use_displaced_stepping (tp))); |
372316f1 PA |
2088 | |
2089 | /* We currently stop all threads of all processes to step-over | |
2090 | in-line. If we need to start a new in-line step-over, let | |
2091 | any pending displaced steps finish first. */ | |
2092 | if (must_be_in_line && displaced_step_in_progress_any_inferior ()) | |
2093 | return 0; | |
2094 | ||
c2829269 PA |
2095 | thread_step_over_chain_remove (tp); |
2096 | ||
2097 | if (step_over_queue_head == NULL) | |
2098 | { | |
2099 | if (debug_infrun) | |
2100 | fprintf_unfiltered (gdb_stdlog, | |
2101 | "infrun: step-over queue now empty\n"); | |
2102 | } | |
2103 | ||
372316f1 PA |
2104 | if (tp->control.trap_expected |
2105 | || tp->resumed | |
2106 | || tp->executing) | |
ad53cd71 | 2107 | { |
4d9d9d04 PA |
2108 | internal_error (__FILE__, __LINE__, |
2109 | "[%s] has inconsistent state: " | |
372316f1 | 2110 | "trap_expected=%d, resumed=%d, executing=%d\n", |
4d9d9d04 PA |
2111 | target_pid_to_str (tp->ptid), |
2112 | tp->control.trap_expected, | |
372316f1 | 2113 | tp->resumed, |
4d9d9d04 | 2114 | tp->executing); |
ad53cd71 | 2115 | } |
1c5cfe86 | 2116 | |
4d9d9d04 PA |
2117 | if (debug_infrun) |
2118 | fprintf_unfiltered (gdb_stdlog, | |
2119 | "infrun: resuming [%s] for step-over\n", | |
2120 | target_pid_to_str (tp->ptid)); | |
2121 | ||
2122 | /* keep_going_pass_signal skips the step-over if the breakpoint | |
2123 | is no longer inserted. In all-stop, we want to keep looking | |
2124 | for a thread that needs a step-over instead of resuming TP, | |
2125 | because we wouldn't be able to resume anything else until the | |
2126 | target stops again. In non-stop, the resume always resumes | |
2127 | only TP, so it's OK to let the thread resume freely. */ | |
fbea99ea | 2128 | if (!target_is_non_stop_p () && !step_what) |
4d9d9d04 | 2129 | continue; |
8550d3b3 | 2130 | |
4d9d9d04 PA |
2131 | switch_to_thread (tp->ptid); |
2132 | reset_ecs (ecs, tp); | |
2133 | keep_going_pass_signal (ecs); | |
1c5cfe86 | 2134 | |
4d9d9d04 PA |
2135 | if (!ecs->wait_some_more) |
2136 | error (_("Command aborted.")); | |
1c5cfe86 | 2137 | |
372316f1 PA |
2138 | gdb_assert (tp->resumed); |
2139 | ||
2140 | /* If we started a new in-line step-over, we're done. */ | |
2141 | if (step_over_info_valid_p ()) | |
2142 | { | |
2143 | gdb_assert (tp->control.trap_expected); | |
2144 | return 1; | |
2145 | } | |
2146 | ||
fbea99ea | 2147 | if (!target_is_non_stop_p ()) |
4d9d9d04 PA |
2148 | { |
2149 | /* On all-stop, shouldn't have resumed unless we needed a | |
2150 | step over. */ | |
2151 | gdb_assert (tp->control.trap_expected | |
2152 | || tp->step_after_step_resume_breakpoint); | |
2153 | ||
2154 | /* With remote targets (at least), in all-stop, we can't | |
2155 | issue any further remote commands until the program stops | |
2156 | again. */ | |
2157 | return 1; | |
1c5cfe86 | 2158 | } |
c2829269 | 2159 | |
4d9d9d04 PA |
2160 | /* Either the thread no longer needed a step-over, or a new |
2161 | displaced stepping sequence started. Even in the latter | |
2162 | case, continue looking. Maybe we can also start another | |
2163 | displaced step on a thread of other process. */ | |
237fc4c9 | 2164 | } |
4d9d9d04 PA |
2165 | |
2166 | return 0; | |
237fc4c9 PA |
2167 | } |
2168 | ||
5231c1fd PA |
2169 | /* Update global variables holding ptids to hold NEW_PTID if they were |
2170 | holding OLD_PTID. */ | |
2171 | static void | |
2172 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
2173 | { | |
2174 | struct displaced_step_request *it; | |
fc1cf338 | 2175 | struct displaced_step_inferior_state *displaced; |
5231c1fd PA |
2176 | |
2177 | if (ptid_equal (inferior_ptid, old_ptid)) | |
2178 | inferior_ptid = new_ptid; | |
2179 | ||
fc1cf338 PA |
2180 | for (displaced = displaced_step_inferior_states; |
2181 | displaced; | |
2182 | displaced = displaced->next) | |
2183 | { | |
2184 | if (ptid_equal (displaced->step_ptid, old_ptid)) | |
2185 | displaced->step_ptid = new_ptid; | |
fc1cf338 | 2186 | } |
5231c1fd PA |
2187 | } |
2188 | ||
237fc4c9 PA |
2189 | \f |
2190 | /* Resuming. */ | |
c906108c SS |
2191 | |
2192 | /* Things to clean up if we QUIT out of resume (). */ | |
c906108c | 2193 | static void |
74b7792f | 2194 | resume_cleanups (void *ignore) |
c906108c | 2195 | { |
34b7e8a6 PA |
2196 | if (!ptid_equal (inferior_ptid, null_ptid)) |
2197 | delete_single_step_breakpoints (inferior_thread ()); | |
7c16b83e | 2198 | |
c906108c SS |
2199 | normal_stop (); |
2200 | } | |
2201 | ||
53904c9e AC |
2202 | static const char schedlock_off[] = "off"; |
2203 | static const char schedlock_on[] = "on"; | |
2204 | static const char schedlock_step[] = "step"; | |
f2665db5 | 2205 | static const char schedlock_replay[] = "replay"; |
40478521 | 2206 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
2207 | schedlock_off, |
2208 | schedlock_on, | |
2209 | schedlock_step, | |
f2665db5 | 2210 | schedlock_replay, |
ef346e04 AC |
2211 | NULL |
2212 | }; | |
f2665db5 | 2213 | static const char *scheduler_mode = schedlock_replay; |
920d2a44 AC |
2214 | static void |
2215 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
2216 | struct cmd_list_element *c, const char *value) | |
2217 | { | |
3e43a32a MS |
2218 | fprintf_filtered (file, |
2219 | _("Mode for locking scheduler " | |
2220 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
2221 | value); |
2222 | } | |
c906108c SS |
2223 | |
2224 | static void | |
96baa820 | 2225 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 2226 | { |
eefe576e AC |
2227 | if (!target_can_lock_scheduler) |
2228 | { | |
2229 | scheduler_mode = schedlock_off; | |
2230 | error (_("Target '%s' cannot support this command."), target_shortname); | |
2231 | } | |
c906108c SS |
2232 | } |
2233 | ||
d4db2f36 PA |
2234 | /* True if execution commands resume all threads of all processes by |
2235 | default; otherwise, resume only threads of the current inferior | |
2236 | process. */ | |
2237 | int sched_multi = 0; | |
2238 | ||
2facfe5c DD |
2239 | /* Try to setup for software single stepping over the specified location. |
2240 | Return 1 if target_resume() should use hardware single step. | |
2241 | ||
2242 | GDBARCH the current gdbarch. | |
2243 | PC the location to step over. */ | |
2244 | ||
2245 | static int | |
2246 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) | |
2247 | { | |
2248 | int hw_step = 1; | |
2249 | ||
f02253f1 HZ |
2250 | if (execution_direction == EXEC_FORWARD |
2251 | && gdbarch_software_single_step_p (gdbarch) | |
99e40580 | 2252 | && gdbarch_software_single_step (gdbarch, get_current_frame ())) |
2facfe5c | 2253 | { |
99e40580 | 2254 | hw_step = 0; |
2facfe5c DD |
2255 | } |
2256 | return hw_step; | |
2257 | } | |
c906108c | 2258 | |
f3263aa4 PA |
2259 | /* See infrun.h. */ |
2260 | ||
09cee04b PA |
2261 | ptid_t |
2262 | user_visible_resume_ptid (int step) | |
2263 | { | |
f3263aa4 | 2264 | ptid_t resume_ptid; |
09cee04b | 2265 | |
09cee04b PA |
2266 | if (non_stop) |
2267 | { | |
2268 | /* With non-stop mode on, threads are always handled | |
2269 | individually. */ | |
2270 | resume_ptid = inferior_ptid; | |
2271 | } | |
2272 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2273 | || (scheduler_mode == schedlock_step && step)) |
09cee04b | 2274 | { |
f3263aa4 PA |
2275 | /* User-settable 'scheduler' mode requires solo thread |
2276 | resume. */ | |
09cee04b PA |
2277 | resume_ptid = inferior_ptid; |
2278 | } | |
f2665db5 MM |
2279 | else if ((scheduler_mode == schedlock_replay) |
2280 | && target_record_will_replay (minus_one_ptid, execution_direction)) | |
2281 | { | |
2282 | /* User-settable 'scheduler' mode requires solo thread resume in replay | |
2283 | mode. */ | |
2284 | resume_ptid = inferior_ptid; | |
2285 | } | |
f3263aa4 PA |
2286 | else if (!sched_multi && target_supports_multi_process ()) |
2287 | { | |
2288 | /* Resume all threads of the current process (and none of other | |
2289 | processes). */ | |
2290 | resume_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
2291 | } | |
2292 | else | |
2293 | { | |
2294 | /* Resume all threads of all processes. */ | |
2295 | resume_ptid = RESUME_ALL; | |
2296 | } | |
09cee04b PA |
2297 | |
2298 | return resume_ptid; | |
2299 | } | |
2300 | ||
fbea99ea PA |
2301 | /* Return a ptid representing the set of threads that we will resume, |
2302 | in the perspective of the target, assuming run control handling | |
2303 | does not require leaving some threads stopped (e.g., stepping past | |
2304 | breakpoint). USER_STEP indicates whether we're about to start the | |
2305 | target for a stepping command. */ | |
2306 | ||
2307 | static ptid_t | |
2308 | internal_resume_ptid (int user_step) | |
2309 | { | |
2310 | /* In non-stop, we always control threads individually. Note that | |
2311 | the target may always work in non-stop mode even with "set | |
2312 | non-stop off", in which case user_visible_resume_ptid could | |
2313 | return a wildcard ptid. */ | |
2314 | if (target_is_non_stop_p ()) | |
2315 | return inferior_ptid; | |
2316 | else | |
2317 | return user_visible_resume_ptid (user_step); | |
2318 | } | |
2319 | ||
64ce06e4 PA |
2320 | /* Wrapper for target_resume, that handles infrun-specific |
2321 | bookkeeping. */ | |
2322 | ||
2323 | static void | |
2324 | do_target_resume (ptid_t resume_ptid, int step, enum gdb_signal sig) | |
2325 | { | |
2326 | struct thread_info *tp = inferior_thread (); | |
2327 | ||
2328 | /* Install inferior's terminal modes. */ | |
2329 | target_terminal_inferior (); | |
2330 | ||
2331 | /* Avoid confusing the next resume, if the next stop/resume | |
2332 | happens to apply to another thread. */ | |
2333 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2334 | ||
8f572e5c PA |
2335 | /* Advise target which signals may be handled silently. |
2336 | ||
2337 | If we have removed breakpoints because we are stepping over one | |
2338 | in-line (in any thread), we need to receive all signals to avoid | |
2339 | accidentally skipping a breakpoint during execution of a signal | |
2340 | handler. | |
2341 | ||
2342 | Likewise if we're displaced stepping, otherwise a trap for a | |
2343 | breakpoint in a signal handler might be confused with the | |
2344 | displaced step finishing. We don't make the displaced_step_fixup | |
2345 | step distinguish the cases instead, because: | |
2346 | ||
2347 | - a backtrace while stopped in the signal handler would show the | |
2348 | scratch pad as frame older than the signal handler, instead of | |
2349 | the real mainline code. | |
2350 | ||
2351 | - when the thread is later resumed, the signal handler would | |
2352 | return to the scratch pad area, which would no longer be | |
2353 | valid. */ | |
2354 | if (step_over_info_valid_p () | |
2355 | || displaced_step_in_progress (ptid_get_pid (tp->ptid))) | |
64ce06e4 PA |
2356 | target_pass_signals (0, NULL); |
2357 | else | |
2358 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); | |
2359 | ||
2360 | target_resume (resume_ptid, step, sig); | |
2361 | } | |
2362 | ||
c906108c SS |
2363 | /* Resume the inferior, but allow a QUIT. This is useful if the user |
2364 | wants to interrupt some lengthy single-stepping operation | |
2365 | (for child processes, the SIGINT goes to the inferior, and so | |
2366 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
2367 | other targets, that's not true). | |
2368 | ||
c906108c SS |
2369 | SIG is the signal to give the inferior (zero for none). */ |
2370 | void | |
64ce06e4 | 2371 | resume (enum gdb_signal sig) |
c906108c | 2372 | { |
74b7792f | 2373 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
515630c5 UW |
2374 | struct regcache *regcache = get_current_regcache (); |
2375 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
4e1c45ea | 2376 | struct thread_info *tp = inferior_thread (); |
515630c5 | 2377 | CORE_ADDR pc = regcache_read_pc (regcache); |
6c95b8df | 2378 | struct address_space *aspace = get_regcache_aspace (regcache); |
b0f16a3e | 2379 | ptid_t resume_ptid; |
856e7dd6 PA |
2380 | /* This represents the user's step vs continue request. When |
2381 | deciding whether "set scheduler-locking step" applies, it's the | |
2382 | user's intention that counts. */ | |
2383 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2384 | /* This represents what we'll actually request the target to do. |
2385 | This can decay from a step to a continue, if e.g., we need to | |
2386 | implement single-stepping with breakpoints (software | |
2387 | single-step). */ | |
6b403daa | 2388 | int step; |
c7e8a53c | 2389 | |
c2829269 PA |
2390 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2391 | ||
c906108c SS |
2392 | QUIT; |
2393 | ||
372316f1 PA |
2394 | if (tp->suspend.waitstatus_pending_p) |
2395 | { | |
2396 | if (debug_infrun) | |
2397 | { | |
2398 | char *statstr; | |
2399 | ||
2400 | statstr = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
2401 | fprintf_unfiltered (gdb_stdlog, | |
2402 | "infrun: resume: thread %s has pending wait status %s " | |
2403 | "(currently_stepping=%d).\n", | |
2404 | target_pid_to_str (tp->ptid), statstr, | |
2405 | currently_stepping (tp)); | |
2406 | xfree (statstr); | |
2407 | } | |
2408 | ||
2409 | tp->resumed = 1; | |
2410 | ||
2411 | /* FIXME: What should we do if we are supposed to resume this | |
2412 | thread with a signal? Maybe we should maintain a queue of | |
2413 | pending signals to deliver. */ | |
2414 | if (sig != GDB_SIGNAL_0) | |
2415 | { | |
fd7dcb94 | 2416 | warning (_("Couldn't deliver signal %s to %s."), |
372316f1 PA |
2417 | gdb_signal_to_name (sig), target_pid_to_str (tp->ptid)); |
2418 | } | |
2419 | ||
2420 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2421 | discard_cleanups (old_cleanups); | |
2422 | ||
2423 | if (target_can_async_p ()) | |
2424 | target_async (1); | |
2425 | return; | |
2426 | } | |
2427 | ||
2428 | tp->stepped_breakpoint = 0; | |
2429 | ||
6b403daa PA |
2430 | /* Depends on stepped_breakpoint. */ |
2431 | step = currently_stepping (tp); | |
2432 | ||
74609e71 YQ |
2433 | if (current_inferior ()->waiting_for_vfork_done) |
2434 | { | |
48f9886d PA |
2435 | /* Don't try to single-step a vfork parent that is waiting for |
2436 | the child to get out of the shared memory region (by exec'ing | |
2437 | or exiting). This is particularly important on software | |
2438 | single-step archs, as the child process would trip on the | |
2439 | software single step breakpoint inserted for the parent | |
2440 | process. Since the parent will not actually execute any | |
2441 | instruction until the child is out of the shared region (such | |
2442 | are vfork's semantics), it is safe to simply continue it. | |
2443 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2444 | the parent, and tell it to `keep_going', which automatically | |
2445 | re-sets it stepping. */ | |
74609e71 YQ |
2446 | if (debug_infrun) |
2447 | fprintf_unfiltered (gdb_stdlog, | |
2448 | "infrun: resume : clear step\n"); | |
a09dd441 | 2449 | step = 0; |
74609e71 YQ |
2450 | } |
2451 | ||
527159b7 | 2452 | if (debug_infrun) |
237fc4c9 | 2453 | fprintf_unfiltered (gdb_stdlog, |
c9737c08 | 2454 | "infrun: resume (step=%d, signal=%s), " |
0d9a9a5f | 2455 | "trap_expected=%d, current thread [%s] at %s\n", |
c9737c08 PA |
2456 | step, gdb_signal_to_symbol_string (sig), |
2457 | tp->control.trap_expected, | |
0d9a9a5f PA |
2458 | target_pid_to_str (inferior_ptid), |
2459 | paddress (gdbarch, pc)); | |
c906108c | 2460 | |
c2c6d25f JM |
2461 | /* Normally, by the time we reach `resume', the breakpoints are either |
2462 | removed or inserted, as appropriate. The exception is if we're sitting | |
2463 | at a permanent breakpoint; we need to step over it, but permanent | |
2464 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2465 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2466 | { |
af48d08f PA |
2467 | if (sig != GDB_SIGNAL_0) |
2468 | { | |
2469 | /* We have a signal to pass to the inferior. The resume | |
2470 | may, or may not take us to the signal handler. If this | |
2471 | is a step, we'll need to stop in the signal handler, if | |
2472 | there's one, (if the target supports stepping into | |
2473 | handlers), or in the next mainline instruction, if | |
2474 | there's no handler. If this is a continue, we need to be | |
2475 | sure to run the handler with all breakpoints inserted. | |
2476 | In all cases, set a breakpoint at the current address | |
2477 | (where the handler returns to), and once that breakpoint | |
2478 | is hit, resume skipping the permanent breakpoint. If | |
2479 | that breakpoint isn't hit, then we've stepped into the | |
2480 | signal handler (or hit some other event). We'll delete | |
2481 | the step-resume breakpoint then. */ | |
2482 | ||
2483 | if (debug_infrun) | |
2484 | fprintf_unfiltered (gdb_stdlog, | |
2485 | "infrun: resume: skipping permanent breakpoint, " | |
2486 | "deliver signal first\n"); | |
2487 | ||
2488 | clear_step_over_info (); | |
2489 | tp->control.trap_expected = 0; | |
2490 | ||
2491 | if (tp->control.step_resume_breakpoint == NULL) | |
2492 | { | |
2493 | /* Set a "high-priority" step-resume, as we don't want | |
2494 | user breakpoints at PC to trigger (again) when this | |
2495 | hits. */ | |
2496 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
2497 | gdb_assert (tp->control.step_resume_breakpoint->loc->permanent); | |
2498 | ||
2499 | tp->step_after_step_resume_breakpoint = step; | |
2500 | } | |
2501 | ||
2502 | insert_breakpoints (); | |
2503 | } | |
2504 | else | |
2505 | { | |
2506 | /* There's no signal to pass, we can go ahead and skip the | |
2507 | permanent breakpoint manually. */ | |
2508 | if (debug_infrun) | |
2509 | fprintf_unfiltered (gdb_stdlog, | |
2510 | "infrun: resume: skipping permanent breakpoint\n"); | |
2511 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); | |
2512 | /* Update pc to reflect the new address from which we will | |
2513 | execute instructions. */ | |
2514 | pc = regcache_read_pc (regcache); | |
2515 | ||
2516 | if (step) | |
2517 | { | |
2518 | /* We've already advanced the PC, so the stepping part | |
2519 | is done. Now we need to arrange for a trap to be | |
2520 | reported to handle_inferior_event. Set a breakpoint | |
2521 | at the current PC, and run to it. Don't update | |
2522 | prev_pc, because if we end in | |
44a1ee51 PA |
2523 | switch_back_to_stepped_thread, we want the "expected |
2524 | thread advanced also" branch to be taken. IOW, we | |
2525 | don't want this thread to step further from PC | |
af48d08f | 2526 | (overstep). */ |
1ac806b8 | 2527 | gdb_assert (!step_over_info_valid_p ()); |
af48d08f PA |
2528 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
2529 | insert_breakpoints (); | |
2530 | ||
fbea99ea | 2531 | resume_ptid = internal_resume_ptid (user_step); |
1ac806b8 | 2532 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
af48d08f | 2533 | discard_cleanups (old_cleanups); |
372316f1 | 2534 | tp->resumed = 1; |
af48d08f PA |
2535 | return; |
2536 | } | |
2537 | } | |
6d350bb5 | 2538 | } |
c2c6d25f | 2539 | |
c1e36e3e PA |
2540 | /* If we have a breakpoint to step over, make sure to do a single |
2541 | step only. Same if we have software watchpoints. */ | |
2542 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2543 | tp->control.may_range_step = 0; | |
2544 | ||
237fc4c9 PA |
2545 | /* If enabled, step over breakpoints by executing a copy of the |
2546 | instruction at a different address. | |
2547 | ||
2548 | We can't use displaced stepping when we have a signal to deliver; | |
2549 | the comments for displaced_step_prepare explain why. The | |
2550 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2551 | signals' explain what we do instead. |
2552 | ||
2553 | We can't use displaced stepping when we are waiting for vfork_done | |
2554 | event, displaced stepping breaks the vfork child similarly as single | |
2555 | step software breakpoint. */ | |
3fc8eb30 PA |
2556 | if (tp->control.trap_expected |
2557 | && use_displaced_stepping (tp) | |
cb71640d | 2558 | && !step_over_info_valid_p () |
a493e3e2 | 2559 | && sig == GDB_SIGNAL_0 |
74609e71 | 2560 | && !current_inferior ()->waiting_for_vfork_done) |
237fc4c9 | 2561 | { |
3fc8eb30 | 2562 | int prepared = displaced_step_prepare (inferior_ptid); |
fc1cf338 | 2563 | |
3fc8eb30 | 2564 | if (prepared == 0) |
d56b7306 | 2565 | { |
4d9d9d04 PA |
2566 | if (debug_infrun) |
2567 | fprintf_unfiltered (gdb_stdlog, | |
2568 | "Got placed in step-over queue\n"); | |
2569 | ||
2570 | tp->control.trap_expected = 0; | |
d56b7306 VP |
2571 | discard_cleanups (old_cleanups); |
2572 | return; | |
2573 | } | |
3fc8eb30 PA |
2574 | else if (prepared < 0) |
2575 | { | |
2576 | /* Fallback to stepping over the breakpoint in-line. */ | |
2577 | ||
2578 | if (target_is_non_stop_p ()) | |
2579 | stop_all_threads (); | |
2580 | ||
2581 | set_step_over_info (get_regcache_aspace (regcache), | |
2582 | regcache_read_pc (regcache), 0); | |
2583 | ||
2584 | step = maybe_software_singlestep (gdbarch, pc); | |
2585 | ||
2586 | insert_breakpoints (); | |
2587 | } | |
2588 | else if (prepared > 0) | |
2589 | { | |
2590 | struct displaced_step_inferior_state *displaced; | |
99e40580 | 2591 | |
3fc8eb30 PA |
2592 | /* Update pc to reflect the new address from which we will |
2593 | execute instructions due to displaced stepping. */ | |
2594 | pc = regcache_read_pc (get_thread_regcache (inferior_ptid)); | |
ca7781d2 | 2595 | |
3fc8eb30 PA |
2596 | displaced = get_displaced_stepping_state (ptid_get_pid (inferior_ptid)); |
2597 | step = gdbarch_displaced_step_hw_singlestep (gdbarch, | |
2598 | displaced->step_closure); | |
2599 | } | |
237fc4c9 PA |
2600 | } |
2601 | ||
2facfe5c | 2602 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2603 | else if (step) |
2facfe5c | 2604 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 2605 | |
30852783 UW |
2606 | /* Currently, our software single-step implementation leads to different |
2607 | results than hardware single-stepping in one situation: when stepping | |
2608 | into delivering a signal which has an associated signal handler, | |
2609 | hardware single-step will stop at the first instruction of the handler, | |
2610 | while software single-step will simply skip execution of the handler. | |
2611 | ||
2612 | For now, this difference in behavior is accepted since there is no | |
2613 | easy way to actually implement single-stepping into a signal handler | |
2614 | without kernel support. | |
2615 | ||
2616 | However, there is one scenario where this difference leads to follow-on | |
2617 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2618 | and then single-stepping. In this case, the software single-step | |
2619 | behavior means that even if there is a *breakpoint* in the signal | |
2620 | handler, GDB still would not stop. | |
2621 | ||
2622 | Fortunately, we can at least fix this particular issue. We detect | |
2623 | here the case where we are about to deliver a signal while software | |
2624 | single-stepping with breakpoints removed. In this situation, we | |
2625 | revert the decisions to remove all breakpoints and insert single- | |
2626 | step breakpoints, and instead we install a step-resume breakpoint | |
2627 | at the current address, deliver the signal without stepping, and | |
2628 | once we arrive back at the step-resume breakpoint, actually step | |
2629 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2630 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2631 | && sig != GDB_SIGNAL_0 |
2632 | && step_over_info_valid_p ()) | |
30852783 UW |
2633 | { |
2634 | /* If we have nested signals or a pending signal is delivered | |
2635 | immediately after a handler returns, might might already have | |
2636 | a step-resume breakpoint set on the earlier handler. We cannot | |
2637 | set another step-resume breakpoint; just continue on until the | |
2638 | original breakpoint is hit. */ | |
2639 | if (tp->control.step_resume_breakpoint == NULL) | |
2640 | { | |
2c03e5be | 2641 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2642 | tp->step_after_step_resume_breakpoint = 1; |
2643 | } | |
2644 | ||
34b7e8a6 | 2645 | delete_single_step_breakpoints (tp); |
30852783 | 2646 | |
31e77af2 | 2647 | clear_step_over_info (); |
30852783 | 2648 | tp->control.trap_expected = 0; |
31e77af2 PA |
2649 | |
2650 | insert_breakpoints (); | |
30852783 UW |
2651 | } |
2652 | ||
b0f16a3e SM |
2653 | /* If STEP is set, it's a request to use hardware stepping |
2654 | facilities. But in that case, we should never | |
2655 | use singlestep breakpoint. */ | |
34b7e8a6 | 2656 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2657 | |
fbea99ea | 2658 | /* Decide the set of threads to ask the target to resume. */ |
1946c4cc | 2659 | if (tp->control.trap_expected) |
b0f16a3e SM |
2660 | { |
2661 | /* We're allowing a thread to run past a breakpoint it has | |
1946c4cc YQ |
2662 | hit, either by single-stepping the thread with the breakpoint |
2663 | removed, or by displaced stepping, with the breakpoint inserted. | |
2664 | In the former case, we need to single-step only this thread, | |
2665 | and keep others stopped, as they can miss this breakpoint if | |
2666 | allowed to run. That's not really a problem for displaced | |
2667 | stepping, but, we still keep other threads stopped, in case | |
2668 | another thread is also stopped for a breakpoint waiting for | |
2669 | its turn in the displaced stepping queue. */ | |
b0f16a3e SM |
2670 | resume_ptid = inferior_ptid; |
2671 | } | |
fbea99ea PA |
2672 | else |
2673 | resume_ptid = internal_resume_ptid (user_step); | |
d4db2f36 | 2674 | |
7f5ef605 PA |
2675 | if (execution_direction != EXEC_REVERSE |
2676 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2677 | { |
372316f1 PA |
2678 | /* There are two cases where we currently need to step a |
2679 | breakpoint instruction when we have a signal to deliver: | |
2680 | ||
2681 | - See handle_signal_stop where we handle random signals that | |
2682 | could take out us out of the stepping range. Normally, in | |
2683 | that case we end up continuing (instead of stepping) over the | |
7f5ef605 PA |
2684 | signal handler with a breakpoint at PC, but there are cases |
2685 | where we should _always_ single-step, even if we have a | |
2686 | step-resume breakpoint, like when a software watchpoint is | |
2687 | set. Assuming single-stepping and delivering a signal at the | |
2688 | same time would takes us to the signal handler, then we could | |
2689 | have removed the breakpoint at PC to step over it. However, | |
2690 | some hardware step targets (like e.g., Mac OS) can't step | |
2691 | into signal handlers, and for those, we need to leave the | |
2692 | breakpoint at PC inserted, as otherwise if the handler | |
2693 | recurses and executes PC again, it'll miss the breakpoint. | |
2694 | So we leave the breakpoint inserted anyway, but we need to | |
2695 | record that we tried to step a breakpoint instruction, so | |
372316f1 PA |
2696 | that adjust_pc_after_break doesn't end up confused. |
2697 | ||
2698 | - In non-stop if we insert a breakpoint (e.g., a step-resume) | |
2699 | in one thread after another thread that was stepping had been | |
2700 | momentarily paused for a step-over. When we re-resume the | |
2701 | stepping thread, it may be resumed from that address with a | |
2702 | breakpoint that hasn't trapped yet. Seen with | |
2703 | gdb.threads/non-stop-fair-events.exp, on targets that don't | |
2704 | do displaced stepping. */ | |
2705 | ||
2706 | if (debug_infrun) | |
2707 | fprintf_unfiltered (gdb_stdlog, | |
2708 | "infrun: resume: [%s] stepped breakpoint\n", | |
2709 | target_pid_to_str (tp->ptid)); | |
7f5ef605 PA |
2710 | |
2711 | tp->stepped_breakpoint = 1; | |
2712 | ||
b0f16a3e SM |
2713 | /* Most targets can step a breakpoint instruction, thus |
2714 | executing it normally. But if this one cannot, just | |
2715 | continue and we will hit it anyway. */ | |
7f5ef605 | 2716 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
b0f16a3e SM |
2717 | step = 0; |
2718 | } | |
ef5cf84e | 2719 | |
b0f16a3e | 2720 | if (debug_displaced |
cb71640d | 2721 | && tp->control.trap_expected |
3fc8eb30 | 2722 | && use_displaced_stepping (tp) |
cb71640d | 2723 | && !step_over_info_valid_p ()) |
b0f16a3e | 2724 | { |
d9b67d9f | 2725 | struct regcache *resume_regcache = get_thread_regcache (tp->ptid); |
b0f16a3e SM |
2726 | struct gdbarch *resume_gdbarch = get_regcache_arch (resume_regcache); |
2727 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); | |
2728 | gdb_byte buf[4]; | |
2729 | ||
2730 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", | |
2731 | paddress (resume_gdbarch, actual_pc)); | |
2732 | read_memory (actual_pc, buf, sizeof (buf)); | |
2733 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
2734 | } | |
237fc4c9 | 2735 | |
b0f16a3e SM |
2736 | if (tp->control.may_range_step) |
2737 | { | |
2738 | /* If we're resuming a thread with the PC out of the step | |
2739 | range, then we're doing some nested/finer run control | |
2740 | operation, like stepping the thread out of the dynamic | |
2741 | linker or the displaced stepping scratch pad. We | |
2742 | shouldn't have allowed a range step then. */ | |
2743 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2744 | } | |
c1e36e3e | 2745 | |
64ce06e4 | 2746 | do_target_resume (resume_ptid, step, sig); |
372316f1 | 2747 | tp->resumed = 1; |
c906108c SS |
2748 | discard_cleanups (old_cleanups); |
2749 | } | |
2750 | \f | |
237fc4c9 | 2751 | /* Proceeding. */ |
c906108c | 2752 | |
4c2f2a79 PA |
2753 | /* See infrun.h. */ |
2754 | ||
2755 | /* Counter that tracks number of user visible stops. This can be used | |
2756 | to tell whether a command has proceeded the inferior past the | |
2757 | current location. This allows e.g., inferior function calls in | |
2758 | breakpoint commands to not interrupt the command list. When the | |
2759 | call finishes successfully, the inferior is standing at the same | |
2760 | breakpoint as if nothing happened (and so we don't call | |
2761 | normal_stop). */ | |
2762 | static ULONGEST current_stop_id; | |
2763 | ||
2764 | /* See infrun.h. */ | |
2765 | ||
2766 | ULONGEST | |
2767 | get_stop_id (void) | |
2768 | { | |
2769 | return current_stop_id; | |
2770 | } | |
2771 | ||
2772 | /* Called when we report a user visible stop. */ | |
2773 | ||
2774 | static void | |
2775 | new_stop_id (void) | |
2776 | { | |
2777 | current_stop_id++; | |
2778 | } | |
2779 | ||
c906108c SS |
2780 | /* Clear out all variables saying what to do when inferior is continued. |
2781 | First do this, then set the ones you want, then call `proceed'. */ | |
2782 | ||
a7212384 UW |
2783 | static void |
2784 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2785 | { |
a7212384 UW |
2786 | if (debug_infrun) |
2787 | fprintf_unfiltered (gdb_stdlog, | |
2788 | "infrun: clear_proceed_status_thread (%s)\n", | |
2789 | target_pid_to_str (tp->ptid)); | |
d6b48e9c | 2790 | |
372316f1 PA |
2791 | /* If we're starting a new sequence, then the previous finished |
2792 | single-step is no longer relevant. */ | |
2793 | if (tp->suspend.waitstatus_pending_p) | |
2794 | { | |
2795 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) | |
2796 | { | |
2797 | if (debug_infrun) | |
2798 | fprintf_unfiltered (gdb_stdlog, | |
2799 | "infrun: clear_proceed_status: pending " | |
2800 | "event of %s was a finished step. " | |
2801 | "Discarding.\n", | |
2802 | target_pid_to_str (tp->ptid)); | |
2803 | ||
2804 | tp->suspend.waitstatus_pending_p = 0; | |
2805 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
2806 | } | |
2807 | else if (debug_infrun) | |
2808 | { | |
2809 | char *statstr; | |
2810 | ||
2811 | statstr = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
2812 | fprintf_unfiltered (gdb_stdlog, | |
2813 | "infrun: clear_proceed_status_thread: thread %s " | |
2814 | "has pending wait status %s " | |
2815 | "(currently_stepping=%d).\n", | |
2816 | target_pid_to_str (tp->ptid), statstr, | |
2817 | currently_stepping (tp)); | |
2818 | xfree (statstr); | |
2819 | } | |
2820 | } | |
2821 | ||
70509625 PA |
2822 | /* If this signal should not be seen by program, give it zero. |
2823 | Used for debugging signals. */ | |
2824 | if (!signal_pass_state (tp->suspend.stop_signal)) | |
2825 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2826 | ||
243a9253 PA |
2827 | thread_fsm_delete (tp->thread_fsm); |
2828 | tp->thread_fsm = NULL; | |
2829 | ||
16c381f0 JK |
2830 | tp->control.trap_expected = 0; |
2831 | tp->control.step_range_start = 0; | |
2832 | tp->control.step_range_end = 0; | |
c1e36e3e | 2833 | tp->control.may_range_step = 0; |
16c381f0 JK |
2834 | tp->control.step_frame_id = null_frame_id; |
2835 | tp->control.step_stack_frame_id = null_frame_id; | |
2836 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
885eeb5b | 2837 | tp->control.step_start_function = NULL; |
a7212384 | 2838 | tp->stop_requested = 0; |
4e1c45ea | 2839 | |
16c381f0 | 2840 | tp->control.stop_step = 0; |
32400beb | 2841 | |
16c381f0 | 2842 | tp->control.proceed_to_finish = 0; |
414c69f7 | 2843 | |
17b2616c | 2844 | tp->control.command_interp = NULL; |
856e7dd6 | 2845 | tp->control.stepping_command = 0; |
17b2616c | 2846 | |
a7212384 | 2847 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 2848 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 2849 | } |
32400beb | 2850 | |
a7212384 | 2851 | void |
70509625 | 2852 | clear_proceed_status (int step) |
a7212384 | 2853 | { |
f2665db5 MM |
2854 | /* With scheduler-locking replay, stop replaying other threads if we're |
2855 | not replaying the user-visible resume ptid. | |
2856 | ||
2857 | This is a convenience feature to not require the user to explicitly | |
2858 | stop replaying the other threads. We're assuming that the user's | |
2859 | intent is to resume tracing the recorded process. */ | |
2860 | if (!non_stop && scheduler_mode == schedlock_replay | |
2861 | && target_record_is_replaying (minus_one_ptid) | |
2862 | && !target_record_will_replay (user_visible_resume_ptid (step), | |
2863 | execution_direction)) | |
2864 | target_record_stop_replaying (); | |
2865 | ||
6c95b8df PA |
2866 | if (!non_stop) |
2867 | { | |
70509625 PA |
2868 | struct thread_info *tp; |
2869 | ptid_t resume_ptid; | |
2870 | ||
2871 | resume_ptid = user_visible_resume_ptid (step); | |
2872 | ||
2873 | /* In all-stop mode, delete the per-thread status of all threads | |
2874 | we're about to resume, implicitly and explicitly. */ | |
2875 | ALL_NON_EXITED_THREADS (tp) | |
2876 | { | |
2877 | if (!ptid_match (tp->ptid, resume_ptid)) | |
2878 | continue; | |
2879 | clear_proceed_status_thread (tp); | |
2880 | } | |
6c95b8df PA |
2881 | } |
2882 | ||
a7212384 UW |
2883 | if (!ptid_equal (inferior_ptid, null_ptid)) |
2884 | { | |
2885 | struct inferior *inferior; | |
2886 | ||
2887 | if (non_stop) | |
2888 | { | |
6c95b8df PA |
2889 | /* If in non-stop mode, only delete the per-thread status of |
2890 | the current thread. */ | |
a7212384 UW |
2891 | clear_proceed_status_thread (inferior_thread ()); |
2892 | } | |
6c95b8df | 2893 | |
d6b48e9c | 2894 | inferior = current_inferior (); |
16c381f0 | 2895 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2896 | } |
2897 | ||
f3b1572e | 2898 | observer_notify_about_to_proceed (); |
c906108c SS |
2899 | } |
2900 | ||
99619bea PA |
2901 | /* Returns true if TP is still stopped at a breakpoint that needs |
2902 | stepping-over in order to make progress. If the breakpoint is gone | |
2903 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b DJ |
2904 | |
2905 | static int | |
6c4cfb24 | 2906 | thread_still_needs_step_over_bp (struct thread_info *tp) |
99619bea PA |
2907 | { |
2908 | if (tp->stepping_over_breakpoint) | |
2909 | { | |
2910 | struct regcache *regcache = get_thread_regcache (tp->ptid); | |
2911 | ||
2912 | if (breakpoint_here_p (get_regcache_aspace (regcache), | |
af48d08f PA |
2913 | regcache_read_pc (regcache)) |
2914 | == ordinary_breakpoint_here) | |
99619bea PA |
2915 | return 1; |
2916 | ||
2917 | tp->stepping_over_breakpoint = 0; | |
2918 | } | |
2919 | ||
2920 | return 0; | |
2921 | } | |
2922 | ||
6c4cfb24 PA |
2923 | /* Check whether thread TP still needs to start a step-over in order |
2924 | to make progress when resumed. Returns an bitwise or of enum | |
2925 | step_over_what bits, indicating what needs to be stepped over. */ | |
2926 | ||
8d297bbf | 2927 | static step_over_what |
6c4cfb24 PA |
2928 | thread_still_needs_step_over (struct thread_info *tp) |
2929 | { | |
2930 | struct inferior *inf = find_inferior_ptid (tp->ptid); | |
8d297bbf | 2931 | step_over_what what = 0; |
6c4cfb24 PA |
2932 | |
2933 | if (thread_still_needs_step_over_bp (tp)) | |
2934 | what |= STEP_OVER_BREAKPOINT; | |
2935 | ||
2936 | if (tp->stepping_over_watchpoint | |
2937 | && !target_have_steppable_watchpoint) | |
2938 | what |= STEP_OVER_WATCHPOINT; | |
2939 | ||
2940 | return what; | |
2941 | } | |
2942 | ||
483805cf PA |
2943 | /* Returns true if scheduler locking applies. STEP indicates whether |
2944 | we're about to do a step/next-like command to a thread. */ | |
2945 | ||
2946 | static int | |
856e7dd6 | 2947 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
2948 | { |
2949 | return (scheduler_mode == schedlock_on | |
2950 | || (scheduler_mode == schedlock_step | |
f2665db5 MM |
2951 | && tp->control.stepping_command) |
2952 | || (scheduler_mode == schedlock_replay | |
2953 | && target_record_will_replay (minus_one_ptid, | |
2954 | execution_direction))); | |
483805cf PA |
2955 | } |
2956 | ||
c906108c SS |
2957 | /* Basic routine for continuing the program in various fashions. |
2958 | ||
2959 | ADDR is the address to resume at, or -1 for resume where stopped. | |
2960 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 2961 | or -1 for act according to how it stopped. |
c906108c | 2962 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
2963 | -1 means return after that and print nothing. |
2964 | You should probably set various step_... variables | |
2965 | before calling here, if you are stepping. | |
c906108c SS |
2966 | |
2967 | You should call clear_proceed_status before calling proceed. */ | |
2968 | ||
2969 | void | |
64ce06e4 | 2970 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 2971 | { |
e58b0e63 PA |
2972 | struct regcache *regcache; |
2973 | struct gdbarch *gdbarch; | |
4e1c45ea | 2974 | struct thread_info *tp; |
e58b0e63 | 2975 | CORE_ADDR pc; |
6c95b8df | 2976 | struct address_space *aspace; |
4d9d9d04 PA |
2977 | ptid_t resume_ptid; |
2978 | struct execution_control_state ecss; | |
2979 | struct execution_control_state *ecs = &ecss; | |
2980 | struct cleanup *old_chain; | |
2981 | int started; | |
c906108c | 2982 | |
e58b0e63 PA |
2983 | /* If we're stopped at a fork/vfork, follow the branch set by the |
2984 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
2985 | resuming the current thread. */ | |
2986 | if (!follow_fork ()) | |
2987 | { | |
2988 | /* The target for some reason decided not to resume. */ | |
2989 | normal_stop (); | |
f148b27e PA |
2990 | if (target_can_async_p ()) |
2991 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
e58b0e63 PA |
2992 | return; |
2993 | } | |
2994 | ||
842951eb PA |
2995 | /* We'll update this if & when we switch to a new thread. */ |
2996 | previous_inferior_ptid = inferior_ptid; | |
2997 | ||
e58b0e63 PA |
2998 | regcache = get_current_regcache (); |
2999 | gdbarch = get_regcache_arch (regcache); | |
6c95b8df | 3000 | aspace = get_regcache_aspace (regcache); |
e58b0e63 | 3001 | pc = regcache_read_pc (regcache); |
2adfaa28 | 3002 | tp = inferior_thread (); |
e58b0e63 | 3003 | |
99619bea PA |
3004 | /* Fill in with reasonable starting values. */ |
3005 | init_thread_stepping_state (tp); | |
3006 | ||
c2829269 PA |
3007 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
3008 | ||
2acceee2 | 3009 | if (addr == (CORE_ADDR) -1) |
c906108c | 3010 | { |
af48d08f PA |
3011 | if (pc == stop_pc |
3012 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here | |
b2175913 | 3013 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
3014 | /* There is a breakpoint at the address we will resume at, |
3015 | step one instruction before inserting breakpoints so that | |
3016 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
3017 | breakpoint). |
3018 | ||
3019 | Note, we don't do this in reverse, because we won't | |
3020 | actually be executing the breakpoint insn anyway. | |
3021 | We'll be (un-)executing the previous instruction. */ | |
99619bea | 3022 | tp->stepping_over_breakpoint = 1; |
515630c5 UW |
3023 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
3024 | && gdbarch_single_step_through_delay (gdbarch, | |
3025 | get_current_frame ())) | |
3352ef37 AC |
3026 | /* We stepped onto an instruction that needs to be stepped |
3027 | again before re-inserting the breakpoint, do so. */ | |
99619bea | 3028 | tp->stepping_over_breakpoint = 1; |
c906108c SS |
3029 | } |
3030 | else | |
3031 | { | |
515630c5 | 3032 | regcache_write_pc (regcache, addr); |
c906108c SS |
3033 | } |
3034 | ||
70509625 PA |
3035 | if (siggnal != GDB_SIGNAL_DEFAULT) |
3036 | tp->suspend.stop_signal = siggnal; | |
3037 | ||
17b2616c PA |
3038 | /* Record the interpreter that issued the execution command that |
3039 | caused this thread to resume. If the top level interpreter is | |
3040 | MI/async, and the execution command was a CLI command | |
3041 | (next/step/etc.), we'll want to print stop event output to the MI | |
3042 | console channel (the stepped-to line, etc.), as if the user | |
3043 | entered the execution command on a real GDB console. */ | |
4d9d9d04 PA |
3044 | tp->control.command_interp = command_interp (); |
3045 | ||
3046 | resume_ptid = user_visible_resume_ptid (tp->control.stepping_command); | |
3047 | ||
3048 | /* If an exception is thrown from this point on, make sure to | |
3049 | propagate GDB's knowledge of the executing state to the | |
3050 | frontend/user running state. */ | |
3051 | old_chain = make_cleanup (finish_thread_state_cleanup, &resume_ptid); | |
3052 | ||
3053 | /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer | |
3054 | threads (e.g., we might need to set threads stepping over | |
3055 | breakpoints first), from the user/frontend's point of view, all | |
3056 | threads in RESUME_PTID are now running. Unless we're calling an | |
3057 | inferior function, as in that case we pretend the inferior | |
3058 | doesn't run at all. */ | |
3059 | if (!tp->control.in_infcall) | |
3060 | set_running (resume_ptid, 1); | |
17b2616c | 3061 | |
527159b7 | 3062 | if (debug_infrun) |
8a9de0e4 | 3063 | fprintf_unfiltered (gdb_stdlog, |
64ce06e4 | 3064 | "infrun: proceed (addr=%s, signal=%s)\n", |
c9737c08 | 3065 | paddress (gdbarch, addr), |
64ce06e4 | 3066 | gdb_signal_to_symbol_string (siggnal)); |
527159b7 | 3067 | |
4d9d9d04 PA |
3068 | annotate_starting (); |
3069 | ||
3070 | /* Make sure that output from GDB appears before output from the | |
3071 | inferior. */ | |
3072 | gdb_flush (gdb_stdout); | |
3073 | ||
3074 | /* In a multi-threaded task we may select another thread and | |
3075 | then continue or step. | |
3076 | ||
3077 | But if a thread that we're resuming had stopped at a breakpoint, | |
3078 | it will immediately cause another breakpoint stop without any | |
3079 | execution (i.e. it will report a breakpoint hit incorrectly). So | |
3080 | we must step over it first. | |
3081 | ||
3082 | Look for threads other than the current (TP) that reported a | |
3083 | breakpoint hit and haven't been resumed yet since. */ | |
3084 | ||
3085 | /* If scheduler locking applies, we can avoid iterating over all | |
3086 | threads. */ | |
3087 | if (!non_stop && !schedlock_applies (tp)) | |
94cc34af | 3088 | { |
4d9d9d04 PA |
3089 | struct thread_info *current = tp; |
3090 | ||
3091 | ALL_NON_EXITED_THREADS (tp) | |
3092 | { | |
3093 | /* Ignore the current thread here. It's handled | |
3094 | afterwards. */ | |
3095 | if (tp == current) | |
3096 | continue; | |
99619bea | 3097 | |
4d9d9d04 PA |
3098 | /* Ignore threads of processes we're not resuming. */ |
3099 | if (!ptid_match (tp->ptid, resume_ptid)) | |
3100 | continue; | |
c906108c | 3101 | |
4d9d9d04 PA |
3102 | if (!thread_still_needs_step_over (tp)) |
3103 | continue; | |
3104 | ||
3105 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
c906108c | 3106 | |
99619bea PA |
3107 | if (debug_infrun) |
3108 | fprintf_unfiltered (gdb_stdlog, | |
3109 | "infrun: need to step-over [%s] first\n", | |
4d9d9d04 | 3110 | target_pid_to_str (tp->ptid)); |
99619bea | 3111 | |
4d9d9d04 | 3112 | thread_step_over_chain_enqueue (tp); |
2adfaa28 | 3113 | } |
31e77af2 | 3114 | |
4d9d9d04 | 3115 | tp = current; |
30852783 UW |
3116 | } |
3117 | ||
4d9d9d04 PA |
3118 | /* Enqueue the current thread last, so that we move all other |
3119 | threads over their breakpoints first. */ | |
3120 | if (tp->stepping_over_breakpoint) | |
3121 | thread_step_over_chain_enqueue (tp); | |
30852783 | 3122 | |
4d9d9d04 PA |
3123 | /* If the thread isn't started, we'll still need to set its prev_pc, |
3124 | so that switch_back_to_stepped_thread knows the thread hasn't | |
3125 | advanced. Must do this before resuming any thread, as in | |
3126 | all-stop/remote, once we resume we can't send any other packet | |
3127 | until the target stops again. */ | |
3128 | tp->prev_pc = regcache_read_pc (regcache); | |
99619bea | 3129 | |
4d9d9d04 | 3130 | started = start_step_over (); |
c906108c | 3131 | |
4d9d9d04 PA |
3132 | if (step_over_info_valid_p ()) |
3133 | { | |
3134 | /* Either this thread started a new in-line step over, or some | |
3135 | other thread was already doing one. In either case, don't | |
3136 | resume anything else until the step-over is finished. */ | |
3137 | } | |
fbea99ea | 3138 | else if (started && !target_is_non_stop_p ()) |
4d9d9d04 PA |
3139 | { |
3140 | /* A new displaced stepping sequence was started. In all-stop, | |
3141 | we can't talk to the target anymore until it next stops. */ | |
3142 | } | |
fbea99ea PA |
3143 | else if (!non_stop && target_is_non_stop_p ()) |
3144 | { | |
3145 | /* In all-stop, but the target is always in non-stop mode. | |
3146 | Start all other threads that are implicitly resumed too. */ | |
3147 | ALL_NON_EXITED_THREADS (tp) | |
3148 | { | |
3149 | /* Ignore threads of processes we're not resuming. */ | |
3150 | if (!ptid_match (tp->ptid, resume_ptid)) | |
3151 | continue; | |
3152 | ||
3153 | if (tp->resumed) | |
3154 | { | |
3155 | if (debug_infrun) | |
3156 | fprintf_unfiltered (gdb_stdlog, | |
3157 | "infrun: proceed: [%s] resumed\n", | |
3158 | target_pid_to_str (tp->ptid)); | |
3159 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); | |
3160 | continue; | |
3161 | } | |
3162 | ||
3163 | if (thread_is_in_step_over_chain (tp)) | |
3164 | { | |
3165 | if (debug_infrun) | |
3166 | fprintf_unfiltered (gdb_stdlog, | |
3167 | "infrun: proceed: [%s] needs step-over\n", | |
3168 | target_pid_to_str (tp->ptid)); | |
3169 | continue; | |
3170 | } | |
3171 | ||
3172 | if (debug_infrun) | |
3173 | fprintf_unfiltered (gdb_stdlog, | |
3174 | "infrun: proceed: resuming %s\n", | |
3175 | target_pid_to_str (tp->ptid)); | |
3176 | ||
3177 | reset_ecs (ecs, tp); | |
3178 | switch_to_thread (tp->ptid); | |
3179 | keep_going_pass_signal (ecs); | |
3180 | if (!ecs->wait_some_more) | |
fd7dcb94 | 3181 | error (_("Command aborted.")); |
fbea99ea PA |
3182 | } |
3183 | } | |
372316f1 | 3184 | else if (!tp->resumed && !thread_is_in_step_over_chain (tp)) |
4d9d9d04 PA |
3185 | { |
3186 | /* The thread wasn't started, and isn't queued, run it now. */ | |
3187 | reset_ecs (ecs, tp); | |
3188 | switch_to_thread (tp->ptid); | |
3189 | keep_going_pass_signal (ecs); | |
3190 | if (!ecs->wait_some_more) | |
fd7dcb94 | 3191 | error (_("Command aborted.")); |
4d9d9d04 | 3192 | } |
c906108c | 3193 | |
4d9d9d04 | 3194 | discard_cleanups (old_chain); |
c906108c | 3195 | |
0b333c5e PA |
3196 | /* Tell the event loop to wait for it to stop. If the target |
3197 | supports asynchronous execution, it'll do this from within | |
3198 | target_resume. */ | |
362646f5 | 3199 | if (!target_can_async_p ()) |
0b333c5e | 3200 | mark_async_event_handler (infrun_async_inferior_event_token); |
c906108c | 3201 | } |
c906108c SS |
3202 | \f |
3203 | ||
3204 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 3205 | |
c906108c | 3206 | void |
8621d6a9 | 3207 | start_remote (int from_tty) |
c906108c | 3208 | { |
d6b48e9c | 3209 | struct inferior *inferior; |
d6b48e9c PA |
3210 | |
3211 | inferior = current_inferior (); | |
16c381f0 | 3212 | inferior->control.stop_soon = STOP_QUIETLY_REMOTE; |
43ff13b4 | 3213 | |
1777feb0 | 3214 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 3215 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 3216 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
3217 | nothing is returned (instead of just blocking). Because of this, |
3218 | targets expecting an immediate response need to, internally, set | |
3219 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 3220 | timeout. */ |
6426a772 JM |
3221 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
3222 | differentiate to its caller what the state of the target is after | |
3223 | the initial open has been performed. Here we're assuming that | |
3224 | the target has stopped. It should be possible to eventually have | |
3225 | target_open() return to the caller an indication that the target | |
3226 | is currently running and GDB state should be set to the same as | |
1777feb0 | 3227 | for an async run. */ |
e4c8541f | 3228 | wait_for_inferior (); |
8621d6a9 DJ |
3229 | |
3230 | /* Now that the inferior has stopped, do any bookkeeping like | |
3231 | loading shared libraries. We want to do this before normal_stop, | |
3232 | so that the displayed frame is up to date. */ | |
3233 | post_create_inferior (¤t_target, from_tty); | |
3234 | ||
6426a772 | 3235 | normal_stop (); |
c906108c SS |
3236 | } |
3237 | ||
3238 | /* Initialize static vars when a new inferior begins. */ | |
3239 | ||
3240 | void | |
96baa820 | 3241 | init_wait_for_inferior (void) |
c906108c SS |
3242 | { |
3243 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 3244 | |
c906108c SS |
3245 | breakpoint_init_inferior (inf_starting); |
3246 | ||
70509625 | 3247 | clear_proceed_status (0); |
9f976b41 | 3248 | |
ca005067 | 3249 | target_last_wait_ptid = minus_one_ptid; |
237fc4c9 | 3250 | |
842951eb | 3251 | previous_inferior_ptid = inferior_ptid; |
0d1e5fa7 | 3252 | |
edb3359d DJ |
3253 | /* Discard any skipped inlined frames. */ |
3254 | clear_inline_frame_state (minus_one_ptid); | |
c906108c | 3255 | } |
237fc4c9 | 3256 | |
c906108c | 3257 | \f |
488f131b | 3258 | |
ec9499be | 3259 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 3260 | |
568d6575 UW |
3261 | static void handle_step_into_function (struct gdbarch *gdbarch, |
3262 | struct execution_control_state *ecs); | |
3263 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
3264 | struct execution_control_state *ecs); | |
4f5d7f63 | 3265 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 3266 | static void check_exception_resume (struct execution_control_state *, |
28106bc2 | 3267 | struct frame_info *); |
611c83ae | 3268 | |
bdc36728 | 3269 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 3270 | static void stop_waiting (struct execution_control_state *ecs); |
d4f3574e | 3271 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 3272 | static void process_event_stop_test (struct execution_control_state *ecs); |
c447ac0b | 3273 | static int switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 3274 | |
252fbfc8 PA |
3275 | /* Callback for iterate over threads. If the thread is stopped, but |
3276 | the user/frontend doesn't know about that yet, go through | |
3277 | normal_stop, as if the thread had just stopped now. ARG points at | |
3278 | a ptid. If PTID is MINUS_ONE_PTID, applies to all threads. If | |
3279 | ptid_is_pid(PTID) is true, applies to all threads of the process | |
3280 | pointed at by PTID. Otherwise, apply only to the thread pointed by | |
3281 | PTID. */ | |
3282 | ||
3283 | static int | |
3284 | infrun_thread_stop_requested_callback (struct thread_info *info, void *arg) | |
3285 | { | |
3286 | ptid_t ptid = * (ptid_t *) arg; | |
3287 | ||
3288 | if ((ptid_equal (info->ptid, ptid) | |
3289 | || ptid_equal (minus_one_ptid, ptid) | |
3290 | || (ptid_is_pid (ptid) | |
3291 | && ptid_get_pid (ptid) == ptid_get_pid (info->ptid))) | |
3292 | && is_running (info->ptid) | |
3293 | && !is_executing (info->ptid)) | |
3294 | { | |
3295 | struct cleanup *old_chain; | |
3296 | struct execution_control_state ecss; | |
3297 | struct execution_control_state *ecs = &ecss; | |
3298 | ||
3299 | memset (ecs, 0, sizeof (*ecs)); | |
3300 | ||
3301 | old_chain = make_cleanup_restore_current_thread (); | |
3302 | ||
f15cb84a YQ |
3303 | overlay_cache_invalid = 1; |
3304 | /* Flush target cache before starting to handle each event. | |
3305 | Target was running and cache could be stale. This is just a | |
3306 | heuristic. Running threads may modify target memory, but we | |
3307 | don't get any event. */ | |
3308 | target_dcache_invalidate (); | |
3309 | ||
252fbfc8 PA |
3310 | /* Go through handle_inferior_event/normal_stop, so we always |
3311 | have consistent output as if the stop event had been | |
3312 | reported. */ | |
3313 | ecs->ptid = info->ptid; | |
243a9253 | 3314 | ecs->event_thread = info; |
252fbfc8 | 3315 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; |
a493e3e2 | 3316 | ecs->ws.value.sig = GDB_SIGNAL_0; |
252fbfc8 PA |
3317 | |
3318 | handle_inferior_event (ecs); | |
3319 | ||
3320 | if (!ecs->wait_some_more) | |
3321 | { | |
243a9253 PA |
3322 | /* Cancel any running execution command. */ |
3323 | thread_cancel_execution_command (info); | |
3324 | ||
252fbfc8 | 3325 | normal_stop (); |
252fbfc8 PA |
3326 | } |
3327 | ||
3328 | do_cleanups (old_chain); | |
3329 | } | |
3330 | ||
3331 | return 0; | |
3332 | } | |
3333 | ||
3334 | /* This function is attached as a "thread_stop_requested" observer. | |
3335 | Cleanup local state that assumed the PTID was to be resumed, and | |
3336 | report the stop to the frontend. */ | |
3337 | ||
2c0b251b | 3338 | static void |
252fbfc8 PA |
3339 | infrun_thread_stop_requested (ptid_t ptid) |
3340 | { | |
c2829269 | 3341 | struct thread_info *tp; |
252fbfc8 | 3342 | |
c2829269 PA |
3343 | /* PTID was requested to stop. Remove matching threads from the |
3344 | step-over queue, so we don't try to resume them | |
3345 | automatically. */ | |
3346 | ALL_NON_EXITED_THREADS (tp) | |
3347 | if (ptid_match (tp->ptid, ptid)) | |
3348 | { | |
3349 | if (thread_is_in_step_over_chain (tp)) | |
3350 | thread_step_over_chain_remove (tp); | |
3351 | } | |
252fbfc8 PA |
3352 | |
3353 | iterate_over_threads (infrun_thread_stop_requested_callback, &ptid); | |
3354 | } | |
3355 | ||
a07daef3 PA |
3356 | static void |
3357 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
3358 | { | |
3359 | if (ptid_equal (target_last_wait_ptid, tp->ptid)) | |
3360 | nullify_last_target_wait_ptid (); | |
3361 | } | |
3362 | ||
0cbcdb96 PA |
3363 | /* Delete the step resume, single-step and longjmp/exception resume |
3364 | breakpoints of TP. */ | |
4e1c45ea | 3365 | |
0cbcdb96 PA |
3366 | static void |
3367 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3368 | { |
0cbcdb96 PA |
3369 | delete_step_resume_breakpoint (tp); |
3370 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3371 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3372 | } |
3373 | ||
0cbcdb96 PA |
3374 | /* If the target still has execution, call FUNC for each thread that |
3375 | just stopped. In all-stop, that's all the non-exited threads; in | |
3376 | non-stop, that's the current thread, only. */ | |
3377 | ||
3378 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3379 | (struct thread_info *tp); | |
4e1c45ea PA |
3380 | |
3381 | static void | |
0cbcdb96 | 3382 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3383 | { |
0cbcdb96 | 3384 | if (!target_has_execution || ptid_equal (inferior_ptid, null_ptid)) |
4e1c45ea PA |
3385 | return; |
3386 | ||
fbea99ea | 3387 | if (target_is_non_stop_p ()) |
4e1c45ea | 3388 | { |
0cbcdb96 PA |
3389 | /* If in non-stop mode, only the current thread stopped. */ |
3390 | func (inferior_thread ()); | |
4e1c45ea PA |
3391 | } |
3392 | else | |
0cbcdb96 PA |
3393 | { |
3394 | struct thread_info *tp; | |
3395 | ||
3396 | /* In all-stop mode, all threads have stopped. */ | |
3397 | ALL_NON_EXITED_THREADS (tp) | |
3398 | { | |
3399 | func (tp); | |
3400 | } | |
3401 | } | |
3402 | } | |
3403 | ||
3404 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3405 | the threads that just stopped. */ | |
3406 | ||
3407 | static void | |
3408 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3409 | { | |
3410 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3411 | } |
3412 | ||
3413 | /* Delete the single-step breakpoints of the threads that just | |
3414 | stopped. */ | |
7c16b83e | 3415 | |
34b7e8a6 PA |
3416 | static void |
3417 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3418 | { | |
3419 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3420 | } |
3421 | ||
1777feb0 | 3422 | /* A cleanup wrapper. */ |
4e1c45ea PA |
3423 | |
3424 | static void | |
0cbcdb96 | 3425 | delete_just_stopped_threads_infrun_breakpoints_cleanup (void *arg) |
4e1c45ea | 3426 | { |
0cbcdb96 | 3427 | delete_just_stopped_threads_infrun_breakpoints (); |
4e1c45ea PA |
3428 | } |
3429 | ||
221e1a37 | 3430 | /* See infrun.h. */ |
223698f8 | 3431 | |
221e1a37 | 3432 | void |
223698f8 DE |
3433 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
3434 | const struct target_waitstatus *ws) | |
3435 | { | |
3436 | char *status_string = target_waitstatus_to_string (ws); | |
3437 | struct ui_file *tmp_stream = mem_fileopen (); | |
3438 | char *text; | |
223698f8 DE |
3439 | |
3440 | /* The text is split over several lines because it was getting too long. | |
3441 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
3442 | output as a unit; we want only one timestamp printed if debug_timestamp | |
3443 | is set. */ | |
3444 | ||
3445 | fprintf_unfiltered (tmp_stream, | |
1176ecec PA |
3446 | "infrun: target_wait (%d.%ld.%ld", |
3447 | ptid_get_pid (waiton_ptid), | |
3448 | ptid_get_lwp (waiton_ptid), | |
3449 | ptid_get_tid (waiton_ptid)); | |
dfd4cc63 | 3450 | if (ptid_get_pid (waiton_ptid) != -1) |
223698f8 DE |
3451 | fprintf_unfiltered (tmp_stream, |
3452 | " [%s]", target_pid_to_str (waiton_ptid)); | |
3453 | fprintf_unfiltered (tmp_stream, ", status) =\n"); | |
3454 | fprintf_unfiltered (tmp_stream, | |
1176ecec | 3455 | "infrun: %d.%ld.%ld [%s],\n", |
dfd4cc63 | 3456 | ptid_get_pid (result_ptid), |
1176ecec PA |
3457 | ptid_get_lwp (result_ptid), |
3458 | ptid_get_tid (result_ptid), | |
dfd4cc63 | 3459 | target_pid_to_str (result_ptid)); |
223698f8 DE |
3460 | fprintf_unfiltered (tmp_stream, |
3461 | "infrun: %s\n", | |
3462 | status_string); | |
3463 | ||
759ef836 | 3464 | text = ui_file_xstrdup (tmp_stream, NULL); |
223698f8 DE |
3465 | |
3466 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
3467 | a gcc error: the format attribute requires a string literal. */ | |
3468 | fprintf_unfiltered (gdb_stdlog, "%s", text); | |
3469 | ||
3470 | xfree (status_string); | |
3471 | xfree (text); | |
3472 | ui_file_delete (tmp_stream); | |
3473 | } | |
3474 | ||
372316f1 PA |
3475 | /* Select a thread at random, out of those which are resumed and have |
3476 | had events. */ | |
3477 | ||
3478 | static struct thread_info * | |
3479 | random_pending_event_thread (ptid_t waiton_ptid) | |
3480 | { | |
3481 | struct thread_info *event_tp; | |
3482 | int num_events = 0; | |
3483 | int random_selector; | |
3484 | ||
3485 | /* First see how many events we have. Count only resumed threads | |
3486 | that have an event pending. */ | |
3487 | ALL_NON_EXITED_THREADS (event_tp) | |
3488 | if (ptid_match (event_tp->ptid, waiton_ptid) | |
3489 | && event_tp->resumed | |
3490 | && event_tp->suspend.waitstatus_pending_p) | |
3491 | num_events++; | |
3492 | ||
3493 | if (num_events == 0) | |
3494 | return NULL; | |
3495 | ||
3496 | /* Now randomly pick a thread out of those that have had events. */ | |
3497 | random_selector = (int) | |
3498 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
3499 | ||
3500 | if (debug_infrun && num_events > 1) | |
3501 | fprintf_unfiltered (gdb_stdlog, | |
3502 | "infrun: Found %d events, selecting #%d\n", | |
3503 | num_events, random_selector); | |
3504 | ||
3505 | /* Select the Nth thread that has had an event. */ | |
3506 | ALL_NON_EXITED_THREADS (event_tp) | |
3507 | if (ptid_match (event_tp->ptid, waiton_ptid) | |
3508 | && event_tp->resumed | |
3509 | && event_tp->suspend.waitstatus_pending_p) | |
3510 | if (random_selector-- == 0) | |
3511 | break; | |
3512 | ||
3513 | return event_tp; | |
3514 | } | |
3515 | ||
3516 | /* Wrapper for target_wait that first checks whether threads have | |
3517 | pending statuses to report before actually asking the target for | |
3518 | more events. */ | |
3519 | ||
3520 | static ptid_t | |
3521 | do_target_wait (ptid_t ptid, struct target_waitstatus *status, int options) | |
3522 | { | |
3523 | ptid_t event_ptid; | |
3524 | struct thread_info *tp; | |
3525 | ||
3526 | /* First check if there is a resumed thread with a wait status | |
3527 | pending. */ | |
3528 | if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid)) | |
3529 | { | |
3530 | tp = random_pending_event_thread (ptid); | |
3531 | } | |
3532 | else | |
3533 | { | |
3534 | if (debug_infrun) | |
3535 | fprintf_unfiltered (gdb_stdlog, | |
3536 | "infrun: Waiting for specific thread %s.\n", | |
3537 | target_pid_to_str (ptid)); | |
3538 | ||
3539 | /* We have a specific thread to check. */ | |
3540 | tp = find_thread_ptid (ptid); | |
3541 | gdb_assert (tp != NULL); | |
3542 | if (!tp->suspend.waitstatus_pending_p) | |
3543 | tp = NULL; | |
3544 | } | |
3545 | ||
3546 | if (tp != NULL | |
3547 | && (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3548 | || tp->suspend.stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
3549 | { | |
3550 | struct regcache *regcache = get_thread_regcache (tp->ptid); | |
3551 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
3552 | CORE_ADDR pc; | |
3553 | int discard = 0; | |
3554 | ||
3555 | pc = regcache_read_pc (regcache); | |
3556 | ||
3557 | if (pc != tp->suspend.stop_pc) | |
3558 | { | |
3559 | if (debug_infrun) | |
3560 | fprintf_unfiltered (gdb_stdlog, | |
3561 | "infrun: PC of %s changed. was=%s, now=%s\n", | |
3562 | target_pid_to_str (tp->ptid), | |
3563 | paddress (gdbarch, tp->prev_pc), | |
3564 | paddress (gdbarch, pc)); | |
3565 | discard = 1; | |
3566 | } | |
3567 | else if (!breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) | |
3568 | { | |
3569 | if (debug_infrun) | |
3570 | fprintf_unfiltered (gdb_stdlog, | |
3571 | "infrun: previous breakpoint of %s, at %s gone\n", | |
3572 | target_pid_to_str (tp->ptid), | |
3573 | paddress (gdbarch, pc)); | |
3574 | ||
3575 | discard = 1; | |
3576 | } | |
3577 | ||
3578 | if (discard) | |
3579 | { | |
3580 | if (debug_infrun) | |
3581 | fprintf_unfiltered (gdb_stdlog, | |
3582 | "infrun: pending event of %s cancelled.\n", | |
3583 | target_pid_to_str (tp->ptid)); | |
3584 | ||
3585 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_SPURIOUS; | |
3586 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3587 | } | |
3588 | } | |
3589 | ||
3590 | if (tp != NULL) | |
3591 | { | |
3592 | if (debug_infrun) | |
3593 | { | |
3594 | char *statstr; | |
3595 | ||
3596 | statstr = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
3597 | fprintf_unfiltered (gdb_stdlog, | |
3598 | "infrun: Using pending wait status %s for %s.\n", | |
3599 | statstr, | |
3600 | target_pid_to_str (tp->ptid)); | |
3601 | xfree (statstr); | |
3602 | } | |
3603 | ||
3604 | /* Now that we've selected our final event LWP, un-adjust its PC | |
3605 | if it was a software breakpoint (and the target doesn't | |
3606 | always adjust the PC itself). */ | |
3607 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3608 | && !target_supports_stopped_by_sw_breakpoint ()) | |
3609 | { | |
3610 | struct regcache *regcache; | |
3611 | struct gdbarch *gdbarch; | |
3612 | int decr_pc; | |
3613 | ||
3614 | regcache = get_thread_regcache (tp->ptid); | |
3615 | gdbarch = get_regcache_arch (regcache); | |
3616 | ||
3617 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
3618 | if (decr_pc != 0) | |
3619 | { | |
3620 | CORE_ADDR pc; | |
3621 | ||
3622 | pc = regcache_read_pc (regcache); | |
3623 | regcache_write_pc (regcache, pc + decr_pc); | |
3624 | } | |
3625 | } | |
3626 | ||
3627 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3628 | *status = tp->suspend.waitstatus; | |
3629 | tp->suspend.waitstatus_pending_p = 0; | |
3630 | ||
3631 | /* Wake up the event loop again, until all pending events are | |
3632 | processed. */ | |
3633 | if (target_is_async_p ()) | |
3634 | mark_async_event_handler (infrun_async_inferior_event_token); | |
3635 | return tp->ptid; | |
3636 | } | |
3637 | ||
3638 | /* But if we don't find one, we'll have to wait. */ | |
3639 | ||
3640 | if (deprecated_target_wait_hook) | |
3641 | event_ptid = deprecated_target_wait_hook (ptid, status, options); | |
3642 | else | |
3643 | event_ptid = target_wait (ptid, status, options); | |
3644 | ||
3645 | return event_ptid; | |
3646 | } | |
3647 | ||
24291992 PA |
3648 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3649 | detaching while a thread is displaced stepping is a recipe for | |
3650 | crashing it, as nothing would readjust the PC out of the scratch | |
3651 | pad. */ | |
3652 | ||
3653 | void | |
3654 | prepare_for_detach (void) | |
3655 | { | |
3656 | struct inferior *inf = current_inferior (); | |
3657 | ptid_t pid_ptid = pid_to_ptid (inf->pid); | |
3658 | struct cleanup *old_chain_1; | |
3659 | struct displaced_step_inferior_state *displaced; | |
3660 | ||
3661 | displaced = get_displaced_stepping_state (inf->pid); | |
3662 | ||
3663 | /* Is any thread of this process displaced stepping? If not, | |
3664 | there's nothing else to do. */ | |
3665 | if (displaced == NULL || ptid_equal (displaced->step_ptid, null_ptid)) | |
3666 | return; | |
3667 | ||
3668 | if (debug_infrun) | |
3669 | fprintf_unfiltered (gdb_stdlog, | |
3670 | "displaced-stepping in-process while detaching"); | |
3671 | ||
3672 | old_chain_1 = make_cleanup_restore_integer (&inf->detaching); | |
3673 | inf->detaching = 1; | |
3674 | ||
3675 | while (!ptid_equal (displaced->step_ptid, null_ptid)) | |
3676 | { | |
3677 | struct cleanup *old_chain_2; | |
3678 | struct execution_control_state ecss; | |
3679 | struct execution_control_state *ecs; | |
3680 | ||
3681 | ecs = &ecss; | |
3682 | memset (ecs, 0, sizeof (*ecs)); | |
3683 | ||
3684 | overlay_cache_invalid = 1; | |
f15cb84a YQ |
3685 | /* Flush target cache before starting to handle each event. |
3686 | Target was running and cache could be stale. This is just a | |
3687 | heuristic. Running threads may modify target memory, but we | |
3688 | don't get any event. */ | |
3689 | target_dcache_invalidate (); | |
24291992 | 3690 | |
372316f1 | 3691 | ecs->ptid = do_target_wait (pid_ptid, &ecs->ws, 0); |
24291992 PA |
3692 | |
3693 | if (debug_infrun) | |
3694 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
3695 | ||
3696 | /* If an error happens while handling the event, propagate GDB's | |
3697 | knowledge of the executing state to the frontend/user running | |
3698 | state. */ | |
3e43a32a MS |
3699 | old_chain_2 = make_cleanup (finish_thread_state_cleanup, |
3700 | &minus_one_ptid); | |
24291992 PA |
3701 | |
3702 | /* Now figure out what to do with the result of the result. */ | |
3703 | handle_inferior_event (ecs); | |
3704 | ||
3705 | /* No error, don't finish the state yet. */ | |
3706 | discard_cleanups (old_chain_2); | |
3707 | ||
3708 | /* Breakpoints and watchpoints are not installed on the target | |
3709 | at this point, and signals are passed directly to the | |
3710 | inferior, so this must mean the process is gone. */ | |
3711 | if (!ecs->wait_some_more) | |
3712 | { | |
3713 | discard_cleanups (old_chain_1); | |
3714 | error (_("Program exited while detaching")); | |
3715 | } | |
3716 | } | |
3717 | ||
3718 | discard_cleanups (old_chain_1); | |
3719 | } | |
3720 | ||
cd0fc7c3 | 3721 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3722 | |
cd0fc7c3 SS |
3723 | If inferior gets a signal, we may decide to start it up again |
3724 | instead of returning. That is why there is a loop in this function. | |
3725 | When this function actually returns it means the inferior | |
3726 | should be left stopped and GDB should read more commands. */ | |
3727 | ||
3728 | void | |
e4c8541f | 3729 | wait_for_inferior (void) |
cd0fc7c3 SS |
3730 | { |
3731 | struct cleanup *old_cleanups; | |
e6f5c25b | 3732 | struct cleanup *thread_state_chain; |
c906108c | 3733 | |
527159b7 | 3734 | if (debug_infrun) |
ae123ec6 | 3735 | fprintf_unfiltered |
e4c8541f | 3736 | (gdb_stdlog, "infrun: wait_for_inferior ()\n"); |
527159b7 | 3737 | |
0cbcdb96 PA |
3738 | old_cleanups |
3739 | = make_cleanup (delete_just_stopped_threads_infrun_breakpoints_cleanup, | |
3740 | NULL); | |
cd0fc7c3 | 3741 | |
e6f5c25b PA |
3742 | /* If an error happens while handling the event, propagate GDB's |
3743 | knowledge of the executing state to the frontend/user running | |
3744 | state. */ | |
3745 | thread_state_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
3746 | ||
c906108c SS |
3747 | while (1) |
3748 | { | |
ae25568b PA |
3749 | struct execution_control_state ecss; |
3750 | struct execution_control_state *ecs = &ecss; | |
963f9c80 | 3751 | ptid_t waiton_ptid = minus_one_ptid; |
29f49a6a | 3752 | |
ae25568b PA |
3753 | memset (ecs, 0, sizeof (*ecs)); |
3754 | ||
ec9499be | 3755 | overlay_cache_invalid = 1; |
ec9499be | 3756 | |
f15cb84a YQ |
3757 | /* Flush target cache before starting to handle each event. |
3758 | Target was running and cache could be stale. This is just a | |
3759 | heuristic. Running threads may modify target memory, but we | |
3760 | don't get any event. */ | |
3761 | target_dcache_invalidate (); | |
3762 | ||
372316f1 | 3763 | ecs->ptid = do_target_wait (waiton_ptid, &ecs->ws, 0); |
c906108c | 3764 | |
f00150c9 | 3765 | if (debug_infrun) |
223698f8 | 3766 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3767 | |
cd0fc7c3 SS |
3768 | /* Now figure out what to do with the result of the result. */ |
3769 | handle_inferior_event (ecs); | |
c906108c | 3770 | |
cd0fc7c3 SS |
3771 | if (!ecs->wait_some_more) |
3772 | break; | |
3773 | } | |
4e1c45ea | 3774 | |
e6f5c25b PA |
3775 | /* No error, don't finish the state yet. */ |
3776 | discard_cleanups (thread_state_chain); | |
3777 | ||
cd0fc7c3 SS |
3778 | do_cleanups (old_cleanups); |
3779 | } | |
c906108c | 3780 | |
d3d4baed PA |
3781 | /* Cleanup that reinstalls the readline callback handler, if the |
3782 | target is running in the background. If while handling the target | |
3783 | event something triggered a secondary prompt, like e.g., a | |
3784 | pagination prompt, we'll have removed the callback handler (see | |
3785 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
3786 | event loop, ready to process further input. Note this has no | |
3787 | effect if the handler hasn't actually been removed, because calling | |
3788 | rl_callback_handler_install resets the line buffer, thus losing | |
3789 | input. */ | |
3790 | ||
3791 | static void | |
3792 | reinstall_readline_callback_handler_cleanup (void *arg) | |
3793 | { | |
6c400b59 PA |
3794 | if (!interpreter_async) |
3795 | { | |
3796 | /* We're not going back to the top level event loop yet. Don't | |
3797 | install the readline callback, as it'd prep the terminal, | |
3798 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
3799 | it the next time the prompt is displayed, when we're ready | |
3800 | for input. */ | |
3801 | return; | |
3802 | } | |
3803 | ||
d3d4baed PA |
3804 | if (async_command_editing_p && !sync_execution) |
3805 | gdb_rl_callback_handler_reinstall (); | |
3806 | } | |
3807 | ||
243a9253 PA |
3808 | /* Clean up the FSMs of threads that are now stopped. In non-stop, |
3809 | that's just the event thread. In all-stop, that's all threads. */ | |
3810 | ||
3811 | static void | |
3812 | clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs) | |
3813 | { | |
3814 | struct thread_info *thr = ecs->event_thread; | |
3815 | ||
3816 | if (thr != NULL && thr->thread_fsm != NULL) | |
3817 | thread_fsm_clean_up (thr->thread_fsm); | |
3818 | ||
3819 | if (!non_stop) | |
3820 | { | |
3821 | ALL_NON_EXITED_THREADS (thr) | |
3822 | { | |
3823 | if (thr->thread_fsm == NULL) | |
3824 | continue; | |
3825 | if (thr == ecs->event_thread) | |
3826 | continue; | |
3827 | ||
3828 | switch_to_thread (thr->ptid); | |
3829 | thread_fsm_clean_up (thr->thread_fsm); | |
3830 | } | |
3831 | ||
3832 | if (ecs->event_thread != NULL) | |
3833 | switch_to_thread (ecs->event_thread->ptid); | |
3834 | } | |
3835 | } | |
3836 | ||
170742de PA |
3837 | /* A cleanup that restores the execution direction to the value saved |
3838 | in *ARG. */ | |
3839 | ||
3840 | static void | |
3841 | restore_execution_direction (void *arg) | |
3842 | { | |
3843 | enum exec_direction_kind *save_exec_dir = (enum exec_direction_kind *) arg; | |
3844 | ||
3845 | execution_direction = *save_exec_dir; | |
3846 | } | |
3847 | ||
1777feb0 | 3848 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 3849 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
3850 | descriptor corresponding to the target. It can be called more than |
3851 | once to complete a single execution command. In such cases we need | |
3852 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
3853 | that this function is called for a single execution command, then |
3854 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 3855 | necessary cleanups. */ |
43ff13b4 JM |
3856 | |
3857 | void | |
fba45db2 | 3858 | fetch_inferior_event (void *client_data) |
43ff13b4 | 3859 | { |
0d1e5fa7 | 3860 | struct execution_control_state ecss; |
a474d7c2 | 3861 | struct execution_control_state *ecs = &ecss; |
4f8d22e3 | 3862 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
29f49a6a | 3863 | struct cleanup *ts_old_chain; |
4f8d22e3 | 3864 | int was_sync = sync_execution; |
170742de | 3865 | enum exec_direction_kind save_exec_dir = execution_direction; |
0f641c01 | 3866 | int cmd_done = 0; |
963f9c80 | 3867 | ptid_t waiton_ptid = minus_one_ptid; |
43ff13b4 | 3868 | |
0d1e5fa7 PA |
3869 | memset (ecs, 0, sizeof (*ecs)); |
3870 | ||
d3d4baed PA |
3871 | /* End up with readline processing input, if necessary. */ |
3872 | make_cleanup (reinstall_readline_callback_handler_cleanup, NULL); | |
3873 | ||
c5187ac6 PA |
3874 | /* We're handling a live event, so make sure we're doing live |
3875 | debugging. If we're looking at traceframes while the target is | |
3876 | running, we're going to need to get back to that mode after | |
3877 | handling the event. */ | |
3878 | if (non_stop) | |
3879 | { | |
3880 | make_cleanup_restore_current_traceframe (); | |
e6e4e701 | 3881 | set_current_traceframe (-1); |
c5187ac6 PA |
3882 | } |
3883 | ||
4f8d22e3 PA |
3884 | if (non_stop) |
3885 | /* In non-stop mode, the user/frontend should not notice a thread | |
3886 | switch due to internal events. Make sure we reverse to the | |
3887 | user selected thread and frame after handling the event and | |
3888 | running any breakpoint commands. */ | |
3889 | make_cleanup_restore_current_thread (); | |
3890 | ||
ec9499be | 3891 | overlay_cache_invalid = 1; |
f15cb84a YQ |
3892 | /* Flush target cache before starting to handle each event. Target |
3893 | was running and cache could be stale. This is just a heuristic. | |
3894 | Running threads may modify target memory, but we don't get any | |
3895 | event. */ | |
3896 | target_dcache_invalidate (); | |
3dd5b83d | 3897 | |
170742de | 3898 | make_cleanup (restore_execution_direction, &save_exec_dir); |
32231432 PA |
3899 | execution_direction = target_execution_direction (); |
3900 | ||
0b333c5e PA |
3901 | ecs->ptid = do_target_wait (waiton_ptid, &ecs->ws, |
3902 | target_can_async_p () ? TARGET_WNOHANG : 0); | |
43ff13b4 | 3903 | |
f00150c9 | 3904 | if (debug_infrun) |
223698f8 | 3905 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3906 | |
29f49a6a PA |
3907 | /* If an error happens while handling the event, propagate GDB's |
3908 | knowledge of the executing state to the frontend/user running | |
3909 | state. */ | |
fbea99ea | 3910 | if (!target_is_non_stop_p ()) |
29f49a6a PA |
3911 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); |
3912 | else | |
3913 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &ecs->ptid); | |
3914 | ||
353d1d73 JK |
3915 | /* Get executed before make_cleanup_restore_current_thread above to apply |
3916 | still for the thread which has thrown the exception. */ | |
3917 | make_bpstat_clear_actions_cleanup (); | |
3918 | ||
7c16b83e PA |
3919 | make_cleanup (delete_just_stopped_threads_infrun_breakpoints_cleanup, NULL); |
3920 | ||
43ff13b4 | 3921 | /* Now figure out what to do with the result of the result. */ |
a474d7c2 | 3922 | handle_inferior_event (ecs); |
43ff13b4 | 3923 | |
a474d7c2 | 3924 | if (!ecs->wait_some_more) |
43ff13b4 | 3925 | { |
c9657e70 | 3926 | struct inferior *inf = find_inferior_ptid (ecs->ptid); |
243a9253 PA |
3927 | int should_stop = 1; |
3928 | struct thread_info *thr = ecs->event_thread; | |
388a7084 | 3929 | int should_notify_stop = 1; |
d6b48e9c | 3930 | |
0cbcdb96 | 3931 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 3932 | |
243a9253 PA |
3933 | if (thr != NULL) |
3934 | { | |
3935 | struct thread_fsm *thread_fsm = thr->thread_fsm; | |
3936 | ||
3937 | if (thread_fsm != NULL) | |
3938 | should_stop = thread_fsm_should_stop (thread_fsm); | |
3939 | } | |
3940 | ||
3941 | if (!should_stop) | |
3942 | { | |
3943 | keep_going (ecs); | |
3944 | } | |
c2d11a7d | 3945 | else |
0f641c01 | 3946 | { |
243a9253 PA |
3947 | clean_up_just_stopped_threads_fsms (ecs); |
3948 | ||
388a7084 PA |
3949 | if (thr != NULL && thr->thread_fsm != NULL) |
3950 | { | |
3951 | should_notify_stop | |
3952 | = thread_fsm_should_notify_stop (thr->thread_fsm); | |
3953 | } | |
3954 | ||
3955 | if (should_notify_stop) | |
3956 | { | |
4c2f2a79 PA |
3957 | int proceeded = 0; |
3958 | ||
388a7084 PA |
3959 | /* We may not find an inferior if this was a process exit. */ |
3960 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) | |
4c2f2a79 | 3961 | proceeded = normal_stop (); |
243a9253 | 3962 | |
4c2f2a79 PA |
3963 | if (!proceeded) |
3964 | { | |
3965 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
3966 | cmd_done = 1; | |
3967 | } | |
388a7084 | 3968 | } |
0f641c01 | 3969 | } |
43ff13b4 | 3970 | } |
4f8d22e3 | 3971 | |
29f49a6a PA |
3972 | /* No error, don't finish the thread states yet. */ |
3973 | discard_cleanups (ts_old_chain); | |
3974 | ||
4f8d22e3 PA |
3975 | /* Revert thread and frame. */ |
3976 | do_cleanups (old_chain); | |
3977 | ||
3978 | /* If the inferior was in sync execution mode, and now isn't, | |
0f641c01 PA |
3979 | restore the prompt (a synchronous execution command has finished, |
3980 | and we're ready for input). */ | |
b4a14fd0 | 3981 | if (interpreter_async && was_sync && !sync_execution) |
92bcb5f9 | 3982 | observer_notify_sync_execution_done (); |
0f641c01 PA |
3983 | |
3984 | if (cmd_done | |
3985 | && !was_sync | |
3986 | && exec_done_display_p | |
3987 | && (ptid_equal (inferior_ptid, null_ptid) | |
3988 | || !is_running (inferior_ptid))) | |
3989 | printf_unfiltered (_("completed.\n")); | |
43ff13b4 JM |
3990 | } |
3991 | ||
edb3359d DJ |
3992 | /* Record the frame and location we're currently stepping through. */ |
3993 | void | |
3994 | set_step_info (struct frame_info *frame, struct symtab_and_line sal) | |
3995 | { | |
3996 | struct thread_info *tp = inferior_thread (); | |
3997 | ||
16c381f0 JK |
3998 | tp->control.step_frame_id = get_frame_id (frame); |
3999 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
4000 | |
4001 | tp->current_symtab = sal.symtab; | |
4002 | tp->current_line = sal.line; | |
4003 | } | |
4004 | ||
0d1e5fa7 PA |
4005 | /* Clear context switchable stepping state. */ |
4006 | ||
4007 | void | |
4e1c45ea | 4008 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 4009 | { |
7f5ef605 | 4010 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 4011 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 4012 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 4013 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
4014 | } |
4015 | ||
c32c64b7 DE |
4016 | /* Set the cached copy of the last ptid/waitstatus. */ |
4017 | ||
4018 | static void | |
4019 | set_last_target_status (ptid_t ptid, struct target_waitstatus status) | |
4020 | { | |
4021 | target_last_wait_ptid = ptid; | |
4022 | target_last_waitstatus = status; | |
4023 | } | |
4024 | ||
e02bc4cc | 4025 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
4026 | target_wait()/deprecated_target_wait_hook(). The data is actually |
4027 | cached by handle_inferior_event(), which gets called immediately | |
4028 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
4029 | |
4030 | void | |
488f131b | 4031 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 4032 | { |
39f77062 | 4033 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
4034 | *status = target_last_waitstatus; |
4035 | } | |
4036 | ||
ac264b3b MS |
4037 | void |
4038 | nullify_last_target_wait_ptid (void) | |
4039 | { | |
4040 | target_last_wait_ptid = minus_one_ptid; | |
4041 | } | |
4042 | ||
dcf4fbde | 4043 | /* Switch thread contexts. */ |
dd80620e MS |
4044 | |
4045 | static void | |
0d1e5fa7 | 4046 | context_switch (ptid_t ptid) |
dd80620e | 4047 | { |
4b51d87b | 4048 | if (debug_infrun && !ptid_equal (ptid, inferior_ptid)) |
fd48f117 DJ |
4049 | { |
4050 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
4051 | target_pid_to_str (inferior_ptid)); | |
4052 | fprintf_unfiltered (gdb_stdlog, "to %s\n", | |
0d1e5fa7 | 4053 | target_pid_to_str (ptid)); |
fd48f117 DJ |
4054 | } |
4055 | ||
0d1e5fa7 | 4056 | switch_to_thread (ptid); |
dd80620e MS |
4057 | } |
4058 | ||
d8dd4d5f PA |
4059 | /* If the target can't tell whether we've hit breakpoints |
4060 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
4061 | check whether that could have been caused by a breakpoint. If so, | |
4062 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
4063 | ||
4fa8626c | 4064 | static void |
d8dd4d5f PA |
4065 | adjust_pc_after_break (struct thread_info *thread, |
4066 | struct target_waitstatus *ws) | |
4fa8626c | 4067 | { |
24a73cce UW |
4068 | struct regcache *regcache; |
4069 | struct gdbarch *gdbarch; | |
6c95b8df | 4070 | struct address_space *aspace; |
118e6252 | 4071 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 4072 | |
4fa8626c DJ |
4073 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
4074 | we aren't, just return. | |
9709f61c DJ |
4075 | |
4076 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
4077 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
4078 | implemented by software breakpoints should be handled through the normal | |
4079 | breakpoint layer. | |
8fb3e588 | 4080 | |
4fa8626c DJ |
4081 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
4082 | different signals (SIGILL or SIGEMT for instance), but it is less | |
4083 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
4084 | gdbarch_decr_pc_after_break. I don't know any specific target that |
4085 | generates these signals at breakpoints (the code has been in GDB since at | |
4086 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 4087 | |
e6cf7916 UW |
4088 | In earlier versions of GDB, a target with |
4089 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
4090 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
4091 | target with both of these set in GDB history, and it seems unlikely to be | |
4092 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 4093 | |
d8dd4d5f | 4094 | if (ws->kind != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
4095 | return; |
4096 | ||
d8dd4d5f | 4097 | if (ws->value.sig != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
4098 | return; |
4099 | ||
4058b839 PA |
4100 | /* In reverse execution, when a breakpoint is hit, the instruction |
4101 | under it has already been de-executed. The reported PC always | |
4102 | points at the breakpoint address, so adjusting it further would | |
4103 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
4104 | architecture: | |
4105 | ||
4106 | B1 0x08000000 : INSN1 | |
4107 | B2 0x08000001 : INSN2 | |
4108 | 0x08000002 : INSN3 | |
4109 | PC -> 0x08000003 : INSN4 | |
4110 | ||
4111 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
4112 | from that point should hit B2 as below. Reading the PC when the | |
4113 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
4114 | been de-executed already. | |
4115 | ||
4116 | B1 0x08000000 : INSN1 | |
4117 | B2 PC -> 0x08000001 : INSN2 | |
4118 | 0x08000002 : INSN3 | |
4119 | 0x08000003 : INSN4 | |
4120 | ||
4121 | We can't apply the same logic as for forward execution, because | |
4122 | we would wrongly adjust the PC to 0x08000000, since there's a | |
4123 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
4124 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
4125 | behaviour. */ | |
4126 | if (execution_direction == EXEC_REVERSE) | |
4127 | return; | |
4128 | ||
1cf4d951 PA |
4129 | /* If the target can tell whether the thread hit a SW breakpoint, |
4130 | trust it. Targets that can tell also adjust the PC | |
4131 | themselves. */ | |
4132 | if (target_supports_stopped_by_sw_breakpoint ()) | |
4133 | return; | |
4134 | ||
4135 | /* Note that relying on whether a breakpoint is planted in memory to | |
4136 | determine this can fail. E.g,. the breakpoint could have been | |
4137 | removed since. Or the thread could have been told to step an | |
4138 | instruction the size of a breakpoint instruction, and only | |
4139 | _after_ was a breakpoint inserted at its address. */ | |
4140 | ||
24a73cce UW |
4141 | /* If this target does not decrement the PC after breakpoints, then |
4142 | we have nothing to do. */ | |
d8dd4d5f | 4143 | regcache = get_thread_regcache (thread->ptid); |
24a73cce | 4144 | gdbarch = get_regcache_arch (regcache); |
118e6252 | 4145 | |
527a273a | 4146 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 4147 | if (decr_pc == 0) |
24a73cce UW |
4148 | return; |
4149 | ||
6c95b8df PA |
4150 | aspace = get_regcache_aspace (regcache); |
4151 | ||
8aad930b AC |
4152 | /* Find the location where (if we've hit a breakpoint) the |
4153 | breakpoint would be. */ | |
118e6252 | 4154 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 4155 | |
1cf4d951 PA |
4156 | /* If the target can't tell whether a software breakpoint triggered, |
4157 | fallback to figuring it out based on breakpoints we think were | |
4158 | inserted in the target, and on whether the thread was stepped or | |
4159 | continued. */ | |
4160 | ||
1c5cfe86 PA |
4161 | /* Check whether there actually is a software breakpoint inserted at |
4162 | that location. | |
4163 | ||
4164 | If in non-stop mode, a race condition is possible where we've | |
4165 | removed a breakpoint, but stop events for that breakpoint were | |
4166 | already queued and arrive later. To suppress those spurious | |
4167 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
4168 | and retire them after a number of stop events are reported. Note |
4169 | this is an heuristic and can thus get confused. The real fix is | |
4170 | to get the "stopped by SW BP and needs adjustment" info out of | |
4171 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 4172 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
4173 | || (target_is_non_stop_p () |
4174 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 4175 | { |
77f9e713 | 4176 | struct cleanup *old_cleanups = make_cleanup (null_cleanup, NULL); |
abbb1732 | 4177 | |
8213266a | 4178 | if (record_full_is_used ()) |
77f9e713 | 4179 | record_full_gdb_operation_disable_set (); |
96429cc8 | 4180 | |
1c0fdd0e UW |
4181 | /* When using hardware single-step, a SIGTRAP is reported for both |
4182 | a completed single-step and a software breakpoint. Need to | |
4183 | differentiate between the two, as the latter needs adjusting | |
4184 | but the former does not. | |
4185 | ||
4186 | The SIGTRAP can be due to a completed hardware single-step only if | |
4187 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4188 | - this thread is currently being stepped |
4189 | ||
4190 | If any of these events did not occur, we must have stopped due | |
4191 | to hitting a software breakpoint, and have to back up to the | |
4192 | breakpoint address. | |
4193 | ||
4194 | As a special case, we could have hardware single-stepped a | |
4195 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4196 | we also need to back up to the breakpoint address. */ | |
4197 | ||
d8dd4d5f PA |
4198 | if (thread_has_single_step_breakpoints_set (thread) |
4199 | || !currently_stepping (thread) | |
4200 | || (thread->stepped_breakpoint | |
4201 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 4202 | regcache_write_pc (regcache, breakpoint_pc); |
96429cc8 | 4203 | |
77f9e713 | 4204 | do_cleanups (old_cleanups); |
8aad930b | 4205 | } |
4fa8626c DJ |
4206 | } |
4207 | ||
edb3359d DJ |
4208 | static int |
4209 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) | |
4210 | { | |
4211 | for (frame = get_prev_frame (frame); | |
4212 | frame != NULL; | |
4213 | frame = get_prev_frame (frame)) | |
4214 | { | |
4215 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
4216 | return 1; | |
4217 | if (get_frame_type (frame) != INLINE_FRAME) | |
4218 | break; | |
4219 | } | |
4220 | ||
4221 | return 0; | |
4222 | } | |
4223 | ||
a96d9b2e SDJ |
4224 | /* Auxiliary function that handles syscall entry/return events. |
4225 | It returns 1 if the inferior should keep going (and GDB | |
4226 | should ignore the event), or 0 if the event deserves to be | |
4227 | processed. */ | |
ca2163eb | 4228 | |
a96d9b2e | 4229 | static int |
ca2163eb | 4230 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 4231 | { |
ca2163eb | 4232 | struct regcache *regcache; |
ca2163eb PA |
4233 | int syscall_number; |
4234 | ||
4235 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
4236 | context_switch (ecs->ptid); | |
4237 | ||
4238 | regcache = get_thread_regcache (ecs->ptid); | |
f90263c1 | 4239 | syscall_number = ecs->ws.value.syscall_number; |
ca2163eb PA |
4240 | stop_pc = regcache_read_pc (regcache); |
4241 | ||
a96d9b2e SDJ |
4242 | if (catch_syscall_enabled () > 0 |
4243 | && catching_syscall_number (syscall_number) > 0) | |
4244 | { | |
4245 | if (debug_infrun) | |
4246 | fprintf_unfiltered (gdb_stdlog, "infrun: syscall number = '%d'\n", | |
4247 | syscall_number); | |
a96d9b2e | 4248 | |
16c381f0 | 4249 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 4250 | = bpstat_stop_status (get_regcache_aspace (regcache), |
09ac7c10 | 4251 | stop_pc, ecs->ptid, &ecs->ws); |
ab04a2af | 4252 | |
ce12b012 | 4253 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
4254 | { |
4255 | /* Catchpoint hit. */ | |
ca2163eb PA |
4256 | return 0; |
4257 | } | |
a96d9b2e | 4258 | } |
ca2163eb PA |
4259 | |
4260 | /* If no catchpoint triggered for this, then keep going. */ | |
ca2163eb PA |
4261 | keep_going (ecs); |
4262 | return 1; | |
a96d9b2e SDJ |
4263 | } |
4264 | ||
7e324e48 GB |
4265 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
4266 | ||
4267 | static void | |
4268 | fill_in_stop_func (struct gdbarch *gdbarch, | |
4269 | struct execution_control_state *ecs) | |
4270 | { | |
4271 | if (!ecs->stop_func_filled_in) | |
4272 | { | |
4273 | /* Don't care about return value; stop_func_start and stop_func_name | |
4274 | will both be 0 if it doesn't work. */ | |
4275 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
4276 | &ecs->stop_func_start, &ecs->stop_func_end); | |
4277 | ecs->stop_func_start | |
4278 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
4279 | ||
591a12a1 UW |
4280 | if (gdbarch_skip_entrypoint_p (gdbarch)) |
4281 | ecs->stop_func_start = gdbarch_skip_entrypoint (gdbarch, | |
4282 | ecs->stop_func_start); | |
4283 | ||
7e324e48 GB |
4284 | ecs->stop_func_filled_in = 1; |
4285 | } | |
4286 | } | |
4287 | ||
4f5d7f63 PA |
4288 | |
4289 | /* Return the STOP_SOON field of the inferior pointed at by PTID. */ | |
4290 | ||
4291 | static enum stop_kind | |
4292 | get_inferior_stop_soon (ptid_t ptid) | |
4293 | { | |
c9657e70 | 4294 | struct inferior *inf = find_inferior_ptid (ptid); |
4f5d7f63 PA |
4295 | |
4296 | gdb_assert (inf != NULL); | |
4297 | return inf->control.stop_soon; | |
4298 | } | |
4299 | ||
372316f1 PA |
4300 | /* Wait for one event. Store the resulting waitstatus in WS, and |
4301 | return the event ptid. */ | |
4302 | ||
4303 | static ptid_t | |
4304 | wait_one (struct target_waitstatus *ws) | |
4305 | { | |
4306 | ptid_t event_ptid; | |
4307 | ptid_t wait_ptid = minus_one_ptid; | |
4308 | ||
4309 | overlay_cache_invalid = 1; | |
4310 | ||
4311 | /* Flush target cache before starting to handle each event. | |
4312 | Target was running and cache could be stale. This is just a | |
4313 | heuristic. Running threads may modify target memory, but we | |
4314 | don't get any event. */ | |
4315 | target_dcache_invalidate (); | |
4316 | ||
4317 | if (deprecated_target_wait_hook) | |
4318 | event_ptid = deprecated_target_wait_hook (wait_ptid, ws, 0); | |
4319 | else | |
4320 | event_ptid = target_wait (wait_ptid, ws, 0); | |
4321 | ||
4322 | if (debug_infrun) | |
4323 | print_target_wait_results (wait_ptid, event_ptid, ws); | |
4324 | ||
4325 | return event_ptid; | |
4326 | } | |
4327 | ||
4328 | /* Generate a wrapper for target_stopped_by_REASON that works on PTID | |
4329 | instead of the current thread. */ | |
4330 | #define THREAD_STOPPED_BY(REASON) \ | |
4331 | static int \ | |
4332 | thread_stopped_by_ ## REASON (ptid_t ptid) \ | |
4333 | { \ | |
4334 | struct cleanup *old_chain; \ | |
4335 | int res; \ | |
4336 | \ | |
4337 | old_chain = save_inferior_ptid (); \ | |
4338 | inferior_ptid = ptid; \ | |
4339 | \ | |
4340 | res = target_stopped_by_ ## REASON (); \ | |
4341 | \ | |
4342 | do_cleanups (old_chain); \ | |
4343 | \ | |
4344 | return res; \ | |
4345 | } | |
4346 | ||
4347 | /* Generate thread_stopped_by_watchpoint. */ | |
4348 | THREAD_STOPPED_BY (watchpoint) | |
4349 | /* Generate thread_stopped_by_sw_breakpoint. */ | |
4350 | THREAD_STOPPED_BY (sw_breakpoint) | |
4351 | /* Generate thread_stopped_by_hw_breakpoint. */ | |
4352 | THREAD_STOPPED_BY (hw_breakpoint) | |
4353 | ||
4354 | /* Cleanups that switches to the PTID pointed at by PTID_P. */ | |
4355 | ||
4356 | static void | |
4357 | switch_to_thread_cleanup (void *ptid_p) | |
4358 | { | |
4359 | ptid_t ptid = *(ptid_t *) ptid_p; | |
4360 | ||
4361 | switch_to_thread (ptid); | |
4362 | } | |
4363 | ||
4364 | /* Save the thread's event and stop reason to process it later. */ | |
4365 | ||
4366 | static void | |
4367 | save_waitstatus (struct thread_info *tp, struct target_waitstatus *ws) | |
4368 | { | |
4369 | struct regcache *regcache; | |
4370 | struct address_space *aspace; | |
4371 | ||
4372 | if (debug_infrun) | |
4373 | { | |
4374 | char *statstr; | |
4375 | ||
4376 | statstr = target_waitstatus_to_string (ws); | |
4377 | fprintf_unfiltered (gdb_stdlog, | |
4378 | "infrun: saving status %s for %d.%ld.%ld\n", | |
4379 | statstr, | |
4380 | ptid_get_pid (tp->ptid), | |
4381 | ptid_get_lwp (tp->ptid), | |
4382 | ptid_get_tid (tp->ptid)); | |
4383 | xfree (statstr); | |
4384 | } | |
4385 | ||
4386 | /* Record for later. */ | |
4387 | tp->suspend.waitstatus = *ws; | |
4388 | tp->suspend.waitstatus_pending_p = 1; | |
4389 | ||
4390 | regcache = get_thread_regcache (tp->ptid); | |
4391 | aspace = get_regcache_aspace (regcache); | |
4392 | ||
4393 | if (ws->kind == TARGET_WAITKIND_STOPPED | |
4394 | && ws->value.sig == GDB_SIGNAL_TRAP) | |
4395 | { | |
4396 | CORE_ADDR pc = regcache_read_pc (regcache); | |
4397 | ||
4398 | adjust_pc_after_break (tp, &tp->suspend.waitstatus); | |
4399 | ||
4400 | if (thread_stopped_by_watchpoint (tp->ptid)) | |
4401 | { | |
4402 | tp->suspend.stop_reason | |
4403 | = TARGET_STOPPED_BY_WATCHPOINT; | |
4404 | } | |
4405 | else if (target_supports_stopped_by_sw_breakpoint () | |
4406 | && thread_stopped_by_sw_breakpoint (tp->ptid)) | |
4407 | { | |
4408 | tp->suspend.stop_reason | |
4409 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4410 | } | |
4411 | else if (target_supports_stopped_by_hw_breakpoint () | |
4412 | && thread_stopped_by_hw_breakpoint (tp->ptid)) | |
4413 | { | |
4414 | tp->suspend.stop_reason | |
4415 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4416 | } | |
4417 | else if (!target_supports_stopped_by_hw_breakpoint () | |
4418 | && hardware_breakpoint_inserted_here_p (aspace, | |
4419 | pc)) | |
4420 | { | |
4421 | tp->suspend.stop_reason | |
4422 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4423 | } | |
4424 | else if (!target_supports_stopped_by_sw_breakpoint () | |
4425 | && software_breakpoint_inserted_here_p (aspace, | |
4426 | pc)) | |
4427 | { | |
4428 | tp->suspend.stop_reason | |
4429 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4430 | } | |
4431 | else if (!thread_has_single_step_breakpoints_set (tp) | |
4432 | && currently_stepping (tp)) | |
4433 | { | |
4434 | tp->suspend.stop_reason | |
4435 | = TARGET_STOPPED_BY_SINGLE_STEP; | |
4436 | } | |
4437 | } | |
4438 | } | |
4439 | ||
4440 | /* Stop all threads. */ | |
4441 | ||
4442 | static void | |
4443 | stop_all_threads (void) | |
4444 | { | |
4445 | /* We may need multiple passes to discover all threads. */ | |
4446 | int pass; | |
4447 | int iterations = 0; | |
4448 | ptid_t entry_ptid; | |
4449 | struct cleanup *old_chain; | |
4450 | ||
fbea99ea | 4451 | gdb_assert (target_is_non_stop_p ()); |
372316f1 PA |
4452 | |
4453 | if (debug_infrun) | |
4454 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads\n"); | |
4455 | ||
4456 | entry_ptid = inferior_ptid; | |
4457 | old_chain = make_cleanup (switch_to_thread_cleanup, &entry_ptid); | |
4458 | ||
4459 | /* Request threads to stop, and then wait for the stops. Because | |
4460 | threads we already know about can spawn more threads while we're | |
4461 | trying to stop them, and we only learn about new threads when we | |
4462 | update the thread list, do this in a loop, and keep iterating | |
4463 | until two passes find no threads that need to be stopped. */ | |
4464 | for (pass = 0; pass < 2; pass++, iterations++) | |
4465 | { | |
4466 | if (debug_infrun) | |
4467 | fprintf_unfiltered (gdb_stdlog, | |
4468 | "infrun: stop_all_threads, pass=%d, " | |
4469 | "iterations=%d\n", pass, iterations); | |
4470 | while (1) | |
4471 | { | |
4472 | ptid_t event_ptid; | |
4473 | struct target_waitstatus ws; | |
4474 | int need_wait = 0; | |
4475 | struct thread_info *t; | |
4476 | ||
4477 | update_thread_list (); | |
4478 | ||
4479 | /* Go through all threads looking for threads that we need | |
4480 | to tell the target to stop. */ | |
4481 | ALL_NON_EXITED_THREADS (t) | |
4482 | { | |
4483 | if (t->executing) | |
4484 | { | |
4485 | /* If already stopping, don't request a stop again. | |
4486 | We just haven't seen the notification yet. */ | |
4487 | if (!t->stop_requested) | |
4488 | { | |
4489 | if (debug_infrun) | |
4490 | fprintf_unfiltered (gdb_stdlog, | |
4491 | "infrun: %s executing, " | |
4492 | "need stop\n", | |
4493 | target_pid_to_str (t->ptid)); | |
4494 | target_stop (t->ptid); | |
4495 | t->stop_requested = 1; | |
4496 | } | |
4497 | else | |
4498 | { | |
4499 | if (debug_infrun) | |
4500 | fprintf_unfiltered (gdb_stdlog, | |
4501 | "infrun: %s executing, " | |
4502 | "already stopping\n", | |
4503 | target_pid_to_str (t->ptid)); | |
4504 | } | |
4505 | ||
4506 | if (t->stop_requested) | |
4507 | need_wait = 1; | |
4508 | } | |
4509 | else | |
4510 | { | |
4511 | if (debug_infrun) | |
4512 | fprintf_unfiltered (gdb_stdlog, | |
4513 | "infrun: %s not executing\n", | |
4514 | target_pid_to_str (t->ptid)); | |
4515 | ||
4516 | /* The thread may be not executing, but still be | |
4517 | resumed with a pending status to process. */ | |
4518 | t->resumed = 0; | |
4519 | } | |
4520 | } | |
4521 | ||
4522 | if (!need_wait) | |
4523 | break; | |
4524 | ||
4525 | /* If we find new threads on the second iteration, restart | |
4526 | over. We want to see two iterations in a row with all | |
4527 | threads stopped. */ | |
4528 | if (pass > 0) | |
4529 | pass = -1; | |
4530 | ||
4531 | event_ptid = wait_one (&ws); | |
4532 | if (ws.kind == TARGET_WAITKIND_NO_RESUMED) | |
4533 | { | |
4534 | /* All resumed threads exited. */ | |
4535 | } | |
4536 | else if (ws.kind == TARGET_WAITKIND_EXITED | |
4537 | || ws.kind == TARGET_WAITKIND_SIGNALLED) | |
4538 | { | |
4539 | if (debug_infrun) | |
4540 | { | |
4541 | ptid_t ptid = pid_to_ptid (ws.value.integer); | |
4542 | ||
4543 | fprintf_unfiltered (gdb_stdlog, | |
4544 | "infrun: %s exited while " | |
4545 | "stopping threads\n", | |
4546 | target_pid_to_str (ptid)); | |
4547 | } | |
4548 | } | |
4549 | else | |
4550 | { | |
4551 | t = find_thread_ptid (event_ptid); | |
4552 | if (t == NULL) | |
4553 | t = add_thread (event_ptid); | |
4554 | ||
4555 | t->stop_requested = 0; | |
4556 | t->executing = 0; | |
4557 | t->resumed = 0; | |
4558 | t->control.may_range_step = 0; | |
4559 | ||
4560 | if (ws.kind == TARGET_WAITKIND_STOPPED | |
4561 | && ws.value.sig == GDB_SIGNAL_0) | |
4562 | { | |
4563 | /* We caught the event that we intended to catch, so | |
4564 | there's no event pending. */ | |
4565 | t->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
4566 | t->suspend.waitstatus_pending_p = 0; | |
4567 | ||
4568 | if (displaced_step_fixup (t->ptid, GDB_SIGNAL_0) < 0) | |
4569 | { | |
4570 | /* Add it back to the step-over queue. */ | |
4571 | if (debug_infrun) | |
4572 | { | |
4573 | fprintf_unfiltered (gdb_stdlog, | |
4574 | "infrun: displaced-step of %s " | |
4575 | "canceled: adding back to the " | |
4576 | "step-over queue\n", | |
4577 | target_pid_to_str (t->ptid)); | |
4578 | } | |
4579 | t->control.trap_expected = 0; | |
4580 | thread_step_over_chain_enqueue (t); | |
4581 | } | |
4582 | } | |
4583 | else | |
4584 | { | |
4585 | enum gdb_signal sig; | |
4586 | struct regcache *regcache; | |
4587 | struct address_space *aspace; | |
4588 | ||
4589 | if (debug_infrun) | |
4590 | { | |
4591 | char *statstr; | |
4592 | ||
4593 | statstr = target_waitstatus_to_string (&ws); | |
4594 | fprintf_unfiltered (gdb_stdlog, | |
4595 | "infrun: target_wait %s, saving " | |
4596 | "status for %d.%ld.%ld\n", | |
4597 | statstr, | |
4598 | ptid_get_pid (t->ptid), | |
4599 | ptid_get_lwp (t->ptid), | |
4600 | ptid_get_tid (t->ptid)); | |
4601 | xfree (statstr); | |
4602 | } | |
4603 | ||
4604 | /* Record for later. */ | |
4605 | save_waitstatus (t, &ws); | |
4606 | ||
4607 | sig = (ws.kind == TARGET_WAITKIND_STOPPED | |
4608 | ? ws.value.sig : GDB_SIGNAL_0); | |
4609 | ||
4610 | if (displaced_step_fixup (t->ptid, sig) < 0) | |
4611 | { | |
4612 | /* Add it back to the step-over queue. */ | |
4613 | t->control.trap_expected = 0; | |
4614 | thread_step_over_chain_enqueue (t); | |
4615 | } | |
4616 | ||
4617 | regcache = get_thread_regcache (t->ptid); | |
4618 | t->suspend.stop_pc = regcache_read_pc (regcache); | |
4619 | ||
4620 | if (debug_infrun) | |
4621 | { | |
4622 | fprintf_unfiltered (gdb_stdlog, | |
4623 | "infrun: saved stop_pc=%s for %s " | |
4624 | "(currently_stepping=%d)\n", | |
4625 | paddress (target_gdbarch (), | |
4626 | t->suspend.stop_pc), | |
4627 | target_pid_to_str (t->ptid), | |
4628 | currently_stepping (t)); | |
4629 | } | |
4630 | } | |
4631 | } | |
4632 | } | |
4633 | } | |
4634 | ||
4635 | do_cleanups (old_chain); | |
4636 | ||
4637 | if (debug_infrun) | |
4638 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads done\n"); | |
4639 | } | |
4640 | ||
05ba8510 PA |
4641 | /* Given an execution control state that has been freshly filled in by |
4642 | an event from the inferior, figure out what it means and take | |
4643 | appropriate action. | |
4644 | ||
4645 | The alternatives are: | |
4646 | ||
22bcd14b | 4647 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
4648 | debugger. |
4649 | ||
4650 | 2) keep_going and return; to wait for the next event (set | |
4651 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
4652 | once). */ | |
c906108c | 4653 | |
ec9499be | 4654 | static void |
0b6e5e10 | 4655 | handle_inferior_event_1 (struct execution_control_state *ecs) |
cd0fc7c3 | 4656 | { |
d6b48e9c PA |
4657 | enum stop_kind stop_soon; |
4658 | ||
28736962 PA |
4659 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
4660 | { | |
4661 | /* We had an event in the inferior, but we are not interested in | |
4662 | handling it at this level. The lower layers have already | |
4663 | done what needs to be done, if anything. | |
4664 | ||
4665 | One of the possible circumstances for this is when the | |
4666 | inferior produces output for the console. The inferior has | |
4667 | not stopped, and we are ignoring the event. Another possible | |
4668 | circumstance is any event which the lower level knows will be | |
4669 | reported multiple times without an intervening resume. */ | |
4670 | if (debug_infrun) | |
4671 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n"); | |
4672 | prepare_to_wait (ecs); | |
4673 | return; | |
4674 | } | |
4675 | ||
0e5bf2a8 PA |
4676 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
4677 | && target_can_async_p () && !sync_execution) | |
4678 | { | |
4679 | /* There were no unwaited-for children left in the target, but, | |
4680 | we're not synchronously waiting for events either. Just | |
4681 | ignore. Otherwise, if we were running a synchronous | |
4682 | execution command, we need to cancel it and give the user | |
4683 | back the terminal. */ | |
4684 | if (debug_infrun) | |
4685 | fprintf_unfiltered (gdb_stdlog, | |
4686 | "infrun: TARGET_WAITKIND_NO_RESUMED (ignoring)\n"); | |
4687 | prepare_to_wait (ecs); | |
4688 | return; | |
4689 | } | |
4690 | ||
1777feb0 | 4691 | /* Cache the last pid/waitstatus. */ |
c32c64b7 | 4692 | set_last_target_status (ecs->ptid, ecs->ws); |
e02bc4cc | 4693 | |
ca005067 | 4694 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 4695 | stop_stack_dummy = STOP_NONE; |
ca005067 | 4696 | |
0e5bf2a8 PA |
4697 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
4698 | { | |
4699 | /* No unwaited-for children left. IOW, all resumed children | |
4700 | have exited. */ | |
4701 | if (debug_infrun) | |
4702 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_RESUMED\n"); | |
4703 | ||
4704 | stop_print_frame = 0; | |
22bcd14b | 4705 | stop_waiting (ecs); |
0e5bf2a8 PA |
4706 | return; |
4707 | } | |
4708 | ||
8c90c137 | 4709 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
64776a0b | 4710 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
359f5fe6 PA |
4711 | { |
4712 | ecs->event_thread = find_thread_ptid (ecs->ptid); | |
4713 | /* If it's a new thread, add it to the thread database. */ | |
4714 | if (ecs->event_thread == NULL) | |
4715 | ecs->event_thread = add_thread (ecs->ptid); | |
c1e36e3e PA |
4716 | |
4717 | /* Disable range stepping. If the next step request could use a | |
4718 | range, this will be end up re-enabled then. */ | |
4719 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 4720 | } |
88ed393a JK |
4721 | |
4722 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
d8dd4d5f | 4723 | adjust_pc_after_break (ecs->event_thread, &ecs->ws); |
88ed393a JK |
4724 | |
4725 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
4726 | reinit_frame_cache (); | |
4727 | ||
28736962 PA |
4728 | breakpoint_retire_moribund (); |
4729 | ||
2b009048 DJ |
4730 | /* First, distinguish signals caused by the debugger from signals |
4731 | that have to do with the program's own actions. Note that | |
4732 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
4733 | on the operating system version. Here we detect when a SIGILL or | |
4734 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
4735 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
4736 | when we're trying to execute a breakpoint instruction on a | |
4737 | non-executable stack. This happens for call dummy breakpoints | |
4738 | for architectures like SPARC that place call dummies on the | |
4739 | stack. */ | |
2b009048 | 4740 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
4741 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL |
4742 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
4743 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
2b009048 | 4744 | { |
de0a0249 UW |
4745 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
4746 | ||
4747 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), | |
4748 | regcache_read_pc (regcache))) | |
4749 | { | |
4750 | if (debug_infrun) | |
4751 | fprintf_unfiltered (gdb_stdlog, | |
4752 | "infrun: Treating signal as SIGTRAP\n"); | |
a493e3e2 | 4753 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; |
de0a0249 | 4754 | } |
2b009048 DJ |
4755 | } |
4756 | ||
28736962 PA |
4757 | /* Mark the non-executing threads accordingly. In all-stop, all |
4758 | threads of all processes are stopped when we get any event | |
e1316e60 | 4759 | reported. In non-stop mode, only the event thread stops. */ |
372316f1 PA |
4760 | { |
4761 | ptid_t mark_ptid; | |
4762 | ||
fbea99ea | 4763 | if (!target_is_non_stop_p ()) |
372316f1 PA |
4764 | mark_ptid = minus_one_ptid; |
4765 | else if (ecs->ws.kind == TARGET_WAITKIND_SIGNALLED | |
4766 | || ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
4767 | { | |
4768 | /* If we're handling a process exit in non-stop mode, even | |
4769 | though threads haven't been deleted yet, one would think | |
4770 | that there is nothing to do, as threads of the dead process | |
4771 | will be soon deleted, and threads of any other process were | |
4772 | left running. However, on some targets, threads survive a | |
4773 | process exit event. E.g., for the "checkpoint" command, | |
4774 | when the current checkpoint/fork exits, linux-fork.c | |
4775 | automatically switches to another fork from within | |
4776 | target_mourn_inferior, by associating the same | |
4777 | inferior/thread to another fork. We haven't mourned yet at | |
4778 | this point, but we must mark any threads left in the | |
4779 | process as not-executing so that finish_thread_state marks | |
4780 | them stopped (in the user's perspective) if/when we present | |
4781 | the stop to the user. */ | |
4782 | mark_ptid = pid_to_ptid (ptid_get_pid (ecs->ptid)); | |
4783 | } | |
4784 | else | |
4785 | mark_ptid = ecs->ptid; | |
4786 | ||
4787 | set_executing (mark_ptid, 0); | |
4788 | ||
4789 | /* Likewise the resumed flag. */ | |
4790 | set_resumed (mark_ptid, 0); | |
4791 | } | |
8c90c137 | 4792 | |
488f131b JB |
4793 | switch (ecs->ws.kind) |
4794 | { | |
4795 | case TARGET_WAITKIND_LOADED: | |
527159b7 | 4796 | if (debug_infrun) |
8a9de0e4 | 4797 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n"); |
5c09a2c5 PA |
4798 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
4799 | context_switch (ecs->ptid); | |
b0f4b84b DJ |
4800 | /* Ignore gracefully during startup of the inferior, as it might |
4801 | be the shell which has just loaded some objects, otherwise | |
4802 | add the symbols for the newly loaded objects. Also ignore at | |
4803 | the beginning of an attach or remote session; we will query | |
4804 | the full list of libraries once the connection is | |
4805 | established. */ | |
4f5d7f63 PA |
4806 | |
4807 | stop_soon = get_inferior_stop_soon (ecs->ptid); | |
c0236d92 | 4808 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 4809 | { |
edcc5120 TT |
4810 | struct regcache *regcache; |
4811 | ||
edcc5120 TT |
4812 | regcache = get_thread_regcache (ecs->ptid); |
4813 | ||
4814 | handle_solib_event (); | |
4815 | ||
4816 | ecs->event_thread->control.stop_bpstat | |
4817 | = bpstat_stop_status (get_regcache_aspace (regcache), | |
4818 | stop_pc, ecs->ptid, &ecs->ws); | |
ab04a2af | 4819 | |
ce12b012 | 4820 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
edcc5120 TT |
4821 | { |
4822 | /* A catchpoint triggered. */ | |
94c57d6a PA |
4823 | process_event_stop_test (ecs); |
4824 | return; | |
edcc5120 | 4825 | } |
488f131b | 4826 | |
b0f4b84b DJ |
4827 | /* If requested, stop when the dynamic linker notifies |
4828 | gdb of events. This allows the user to get control | |
4829 | and place breakpoints in initializer routines for | |
4830 | dynamically loaded objects (among other things). */ | |
a493e3e2 | 4831 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
b0f4b84b DJ |
4832 | if (stop_on_solib_events) |
4833 | { | |
55409f9d DJ |
4834 | /* Make sure we print "Stopped due to solib-event" in |
4835 | normal_stop. */ | |
4836 | stop_print_frame = 1; | |
4837 | ||
22bcd14b | 4838 | stop_waiting (ecs); |
b0f4b84b DJ |
4839 | return; |
4840 | } | |
488f131b | 4841 | } |
b0f4b84b DJ |
4842 | |
4843 | /* If we are skipping through a shell, or through shared library | |
4844 | loading that we aren't interested in, resume the program. If | |
5c09a2c5 | 4845 | we're running the program normally, also resume. */ |
b0f4b84b DJ |
4846 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) |
4847 | { | |
74960c60 VP |
4848 | /* Loading of shared libraries might have changed breakpoint |
4849 | addresses. Make sure new breakpoints are inserted. */ | |
a25a5a45 | 4850 | if (stop_soon == NO_STOP_QUIETLY) |
74960c60 | 4851 | insert_breakpoints (); |
64ce06e4 | 4852 | resume (GDB_SIGNAL_0); |
b0f4b84b DJ |
4853 | prepare_to_wait (ecs); |
4854 | return; | |
4855 | } | |
4856 | ||
5c09a2c5 PA |
4857 | /* But stop if we're attaching or setting up a remote |
4858 | connection. */ | |
4859 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
4860 | || stop_soon == STOP_QUIETLY_REMOTE) | |
4861 | { | |
4862 | if (debug_infrun) | |
4863 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
22bcd14b | 4864 | stop_waiting (ecs); |
5c09a2c5 PA |
4865 | return; |
4866 | } | |
4867 | ||
4868 | internal_error (__FILE__, __LINE__, | |
4869 | _("unhandled stop_soon: %d"), (int) stop_soon); | |
c5aa993b | 4870 | |
488f131b | 4871 | case TARGET_WAITKIND_SPURIOUS: |
527159b7 | 4872 | if (debug_infrun) |
8a9de0e4 | 4873 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n"); |
64776a0b | 4874 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
8b3ee56d | 4875 | context_switch (ecs->ptid); |
64ce06e4 | 4876 | resume (GDB_SIGNAL_0); |
488f131b JB |
4877 | prepare_to_wait (ecs); |
4878 | return; | |
c5aa993b | 4879 | |
488f131b | 4880 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 4881 | case TARGET_WAITKIND_SIGNALLED: |
527159b7 | 4882 | if (debug_infrun) |
940c3c06 PA |
4883 | { |
4884 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
4885 | fprintf_unfiltered (gdb_stdlog, | |
4886 | "infrun: TARGET_WAITKIND_EXITED\n"); | |
4887 | else | |
4888 | fprintf_unfiltered (gdb_stdlog, | |
4889 | "infrun: TARGET_WAITKIND_SIGNALLED\n"); | |
4890 | } | |
4891 | ||
fb66883a | 4892 | inferior_ptid = ecs->ptid; |
c9657e70 | 4893 | set_current_inferior (find_inferior_ptid (ecs->ptid)); |
6c95b8df PA |
4894 | set_current_program_space (current_inferior ()->pspace); |
4895 | handle_vfork_child_exec_or_exit (0); | |
1777feb0 | 4896 | target_terminal_ours (); /* Must do this before mourn anyway. */ |
488f131b | 4897 | |
0c557179 SDJ |
4898 | /* Clearing any previous state of convenience variables. */ |
4899 | clear_exit_convenience_vars (); | |
4900 | ||
940c3c06 PA |
4901 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) |
4902 | { | |
4903 | /* Record the exit code in the convenience variable $_exitcode, so | |
4904 | that the user can inspect this again later. */ | |
4905 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
4906 | (LONGEST) ecs->ws.value.integer); | |
4907 | ||
4908 | /* Also record this in the inferior itself. */ | |
4909 | current_inferior ()->has_exit_code = 1; | |
4910 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
8cf64490 | 4911 | |
98eb56a4 PA |
4912 | /* Support the --return-child-result option. */ |
4913 | return_child_result_value = ecs->ws.value.integer; | |
4914 | ||
fd664c91 | 4915 | observer_notify_exited (ecs->ws.value.integer); |
940c3c06 PA |
4916 | } |
4917 | else | |
0c557179 SDJ |
4918 | { |
4919 | struct regcache *regcache = get_thread_regcache (ecs->ptid); | |
4920 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
4921 | ||
4922 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
4923 | { | |
4924 | /* Set the value of the internal variable $_exitsignal, | |
4925 | which holds the signal uncaught by the inferior. */ | |
4926 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
4927 | gdbarch_gdb_signal_to_target (gdbarch, | |
4928 | ecs->ws.value.sig)); | |
4929 | } | |
4930 | else | |
4931 | { | |
4932 | /* We don't have access to the target's method used for | |
4933 | converting between signal numbers (GDB's internal | |
4934 | representation <-> target's representation). | |
4935 | Therefore, we cannot do a good job at displaying this | |
4936 | information to the user. It's better to just warn | |
4937 | her about it (if infrun debugging is enabled), and | |
4938 | give up. */ | |
4939 | if (debug_infrun) | |
4940 | fprintf_filtered (gdb_stdlog, _("\ | |
4941 | Cannot fill $_exitsignal with the correct signal number.\n")); | |
4942 | } | |
4943 | ||
fd664c91 | 4944 | observer_notify_signal_exited (ecs->ws.value.sig); |
0c557179 | 4945 | } |
8cf64490 | 4946 | |
488f131b JB |
4947 | gdb_flush (gdb_stdout); |
4948 | target_mourn_inferior (); | |
488f131b | 4949 | stop_print_frame = 0; |
22bcd14b | 4950 | stop_waiting (ecs); |
488f131b | 4951 | return; |
c5aa993b | 4952 | |
488f131b | 4953 | /* The following are the only cases in which we keep going; |
1777feb0 | 4954 | the above cases end in a continue or goto. */ |
488f131b | 4955 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 4956 | case TARGET_WAITKIND_VFORKED: |
527159b7 | 4957 | if (debug_infrun) |
fed708ed PA |
4958 | { |
4959 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
4960 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n"); | |
4961 | else | |
4962 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_VFORKED\n"); | |
4963 | } | |
c906108c | 4964 | |
e2d96639 YQ |
4965 | /* Check whether the inferior is displaced stepping. */ |
4966 | { | |
4967 | struct regcache *regcache = get_thread_regcache (ecs->ptid); | |
4968 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
e2d96639 YQ |
4969 | |
4970 | /* If checking displaced stepping is supported, and thread | |
4971 | ecs->ptid is displaced stepping. */ | |
c0987663 | 4972 | if (displaced_step_in_progress_thread (ecs->ptid)) |
e2d96639 YQ |
4973 | { |
4974 | struct inferior *parent_inf | |
c9657e70 | 4975 | = find_inferior_ptid (ecs->ptid); |
e2d96639 YQ |
4976 | struct regcache *child_regcache; |
4977 | CORE_ADDR parent_pc; | |
4978 | ||
4979 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, | |
4980 | indicating that the displaced stepping of syscall instruction | |
4981 | has been done. Perform cleanup for parent process here. Note | |
4982 | that this operation also cleans up the child process for vfork, | |
4983 | because their pages are shared. */ | |
a493e3e2 | 4984 | displaced_step_fixup (ecs->ptid, GDB_SIGNAL_TRAP); |
c2829269 PA |
4985 | /* Start a new step-over in another thread if there's one |
4986 | that needs it. */ | |
4987 | start_step_over (); | |
e2d96639 YQ |
4988 | |
4989 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
4990 | { | |
c0987663 YQ |
4991 | struct displaced_step_inferior_state *displaced |
4992 | = get_displaced_stepping_state (ptid_get_pid (ecs->ptid)); | |
4993 | ||
e2d96639 YQ |
4994 | /* Restore scratch pad for child process. */ |
4995 | displaced_step_restore (displaced, ecs->ws.value.related_pid); | |
4996 | } | |
4997 | ||
4998 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, | |
4999 | the child's PC is also within the scratchpad. Set the child's PC | |
5000 | to the parent's PC value, which has already been fixed up. | |
5001 | FIXME: we use the parent's aspace here, although we're touching | |
5002 | the child, because the child hasn't been added to the inferior | |
5003 | list yet at this point. */ | |
5004 | ||
5005 | child_regcache | |
5006 | = get_thread_arch_aspace_regcache (ecs->ws.value.related_pid, | |
5007 | gdbarch, | |
5008 | parent_inf->aspace); | |
5009 | /* Read PC value of parent process. */ | |
5010 | parent_pc = regcache_read_pc (regcache); | |
5011 | ||
5012 | if (debug_displaced) | |
5013 | fprintf_unfiltered (gdb_stdlog, | |
5014 | "displaced: write child pc from %s to %s\n", | |
5015 | paddress (gdbarch, | |
5016 | regcache_read_pc (child_regcache)), | |
5017 | paddress (gdbarch, parent_pc)); | |
5018 | ||
5019 | regcache_write_pc (child_regcache, parent_pc); | |
5020 | } | |
5021 | } | |
5022 | ||
5a2901d9 | 5023 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
c3a01a22 | 5024 | context_switch (ecs->ptid); |
5a2901d9 | 5025 | |
b242c3c2 PA |
5026 | /* Immediately detach breakpoints from the child before there's |
5027 | any chance of letting the user delete breakpoints from the | |
5028 | breakpoint lists. If we don't do this early, it's easy to | |
5029 | leave left over traps in the child, vis: "break foo; catch | |
5030 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
5031 | the fork on the last `continue', and by that time the | |
5032 | breakpoint at "foo" is long gone from the breakpoint table. | |
5033 | If we vforked, then we don't need to unpatch here, since both | |
5034 | parent and child are sharing the same memory pages; we'll | |
5035 | need to unpatch at follow/detach time instead to be certain | |
5036 | that new breakpoints added between catchpoint hit time and | |
5037 | vfork follow are detached. */ | |
5038 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
5039 | { | |
b242c3c2 PA |
5040 | /* This won't actually modify the breakpoint list, but will |
5041 | physically remove the breakpoints from the child. */ | |
d80ee84f | 5042 | detach_breakpoints (ecs->ws.value.related_pid); |
b242c3c2 PA |
5043 | } |
5044 | ||
34b7e8a6 | 5045 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 5046 | |
e58b0e63 PA |
5047 | /* In case the event is caught by a catchpoint, remember that |
5048 | the event is to be followed at the next resume of the thread, | |
5049 | and not immediately. */ | |
5050 | ecs->event_thread->pending_follow = ecs->ws; | |
5051 | ||
fb14de7b | 5052 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
675bf4cb | 5053 | |
16c381f0 | 5054 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 5055 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
09ac7c10 | 5056 | stop_pc, ecs->ptid, &ecs->ws); |
675bf4cb | 5057 | |
ce12b012 PA |
5058 | /* If no catchpoint triggered for this, then keep going. Note |
5059 | that we're interested in knowing the bpstat actually causes a | |
5060 | stop, not just if it may explain the signal. Software | |
5061 | watchpoints, for example, always appear in the bpstat. */ | |
5062 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 5063 | { |
6c95b8df PA |
5064 | ptid_t parent; |
5065 | ptid_t child; | |
e58b0e63 | 5066 | int should_resume; |
3e43a32a MS |
5067 | int follow_child |
5068 | = (follow_fork_mode_string == follow_fork_mode_child); | |
e58b0e63 | 5069 | |
a493e3e2 | 5070 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
e58b0e63 PA |
5071 | |
5072 | should_resume = follow_fork (); | |
5073 | ||
6c95b8df PA |
5074 | parent = ecs->ptid; |
5075 | child = ecs->ws.value.related_pid; | |
5076 | ||
5077 | /* In non-stop mode, also resume the other branch. */ | |
fbea99ea PA |
5078 | if (!detach_fork && (non_stop |
5079 | || (sched_multi && target_is_non_stop_p ()))) | |
6c95b8df PA |
5080 | { |
5081 | if (follow_child) | |
5082 | switch_to_thread (parent); | |
5083 | else | |
5084 | switch_to_thread (child); | |
5085 | ||
5086 | ecs->event_thread = inferior_thread (); | |
5087 | ecs->ptid = inferior_ptid; | |
5088 | keep_going (ecs); | |
5089 | } | |
5090 | ||
5091 | if (follow_child) | |
5092 | switch_to_thread (child); | |
5093 | else | |
5094 | switch_to_thread (parent); | |
5095 | ||
e58b0e63 PA |
5096 | ecs->event_thread = inferior_thread (); |
5097 | ecs->ptid = inferior_ptid; | |
5098 | ||
5099 | if (should_resume) | |
5100 | keep_going (ecs); | |
5101 | else | |
22bcd14b | 5102 | stop_waiting (ecs); |
04e68871 DJ |
5103 | return; |
5104 | } | |
94c57d6a PA |
5105 | process_event_stop_test (ecs); |
5106 | return; | |
488f131b | 5107 | |
6c95b8df PA |
5108 | case TARGET_WAITKIND_VFORK_DONE: |
5109 | /* Done with the shared memory region. Re-insert breakpoints in | |
5110 | the parent, and keep going. */ | |
5111 | ||
5112 | if (debug_infrun) | |
3e43a32a MS |
5113 | fprintf_unfiltered (gdb_stdlog, |
5114 | "infrun: TARGET_WAITKIND_VFORK_DONE\n"); | |
6c95b8df PA |
5115 | |
5116 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
5117 | context_switch (ecs->ptid); | |
5118 | ||
5119 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 5120 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
6c95b8df PA |
5121 | /* This also takes care of reinserting breakpoints in the |
5122 | previously locked inferior. */ | |
5123 | keep_going (ecs); | |
5124 | return; | |
5125 | ||
488f131b | 5126 | case TARGET_WAITKIND_EXECD: |
527159b7 | 5127 | if (debug_infrun) |
fc5261f2 | 5128 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n"); |
488f131b | 5129 | |
5a2901d9 | 5130 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
c3a01a22 | 5131 | context_switch (ecs->ptid); |
5a2901d9 | 5132 | |
fb14de7b | 5133 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
795e548f | 5134 | |
6c95b8df PA |
5135 | /* Do whatever is necessary to the parent branch of the vfork. */ |
5136 | handle_vfork_child_exec_or_exit (1); | |
5137 | ||
795e548f PA |
5138 | /* This causes the eventpoints and symbol table to be reset. |
5139 | Must do this now, before trying to determine whether to | |
5140 | stop. */ | |
71b43ef8 | 5141 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 5142 | |
17d8546e DB |
5143 | /* In follow_exec we may have deleted the original thread and |
5144 | created a new one. Make sure that the event thread is the | |
5145 | execd thread for that case (this is a nop otherwise). */ | |
5146 | ecs->event_thread = inferior_thread (); | |
5147 | ||
16c381f0 | 5148 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 5149 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
09ac7c10 | 5150 | stop_pc, ecs->ptid, &ecs->ws); |
795e548f | 5151 | |
71b43ef8 PA |
5152 | /* Note that this may be referenced from inside |
5153 | bpstat_stop_status above, through inferior_has_execd. */ | |
5154 | xfree (ecs->ws.value.execd_pathname); | |
5155 | ecs->ws.value.execd_pathname = NULL; | |
5156 | ||
04e68871 | 5157 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 5158 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 5159 | { |
a493e3e2 | 5160 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
04e68871 DJ |
5161 | keep_going (ecs); |
5162 | return; | |
5163 | } | |
94c57d6a PA |
5164 | process_event_stop_test (ecs); |
5165 | return; | |
488f131b | 5166 | |
b4dc5ffa MK |
5167 | /* Be careful not to try to gather much state about a thread |
5168 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 5169 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
527159b7 | 5170 | if (debug_infrun) |
3e43a32a MS |
5171 | fprintf_unfiltered (gdb_stdlog, |
5172 | "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); | |
1777feb0 | 5173 | /* Getting the current syscall number. */ |
94c57d6a PA |
5174 | if (handle_syscall_event (ecs) == 0) |
5175 | process_event_stop_test (ecs); | |
5176 | return; | |
c906108c | 5177 | |
488f131b JB |
5178 | /* Before examining the threads further, step this thread to |
5179 | get it entirely out of the syscall. (We get notice of the | |
5180 | event when the thread is just on the verge of exiting a | |
5181 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 5182 | into user code.) */ |
488f131b | 5183 | case TARGET_WAITKIND_SYSCALL_RETURN: |
527159b7 | 5184 | if (debug_infrun) |
3e43a32a MS |
5185 | fprintf_unfiltered (gdb_stdlog, |
5186 | "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); | |
94c57d6a PA |
5187 | if (handle_syscall_event (ecs) == 0) |
5188 | process_event_stop_test (ecs); | |
5189 | return; | |
c906108c | 5190 | |
488f131b | 5191 | case TARGET_WAITKIND_STOPPED: |
527159b7 | 5192 | if (debug_infrun) |
8a9de0e4 | 5193 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n"); |
16c381f0 | 5194 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
4f5d7f63 PA |
5195 | handle_signal_stop (ecs); |
5196 | return; | |
c906108c | 5197 | |
b2175913 | 5198 | case TARGET_WAITKIND_NO_HISTORY: |
4b4e080e PA |
5199 | if (debug_infrun) |
5200 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_HISTORY\n"); | |
b2175913 | 5201 | /* Reverse execution: target ran out of history info. */ |
eab402df | 5202 | |
d1988021 MM |
5203 | /* Switch to the stopped thread. */ |
5204 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
5205 | context_switch (ecs->ptid); | |
5206 | if (debug_infrun) | |
5207 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); | |
5208 | ||
34b7e8a6 | 5209 | delete_just_stopped_threads_single_step_breakpoints (); |
d1988021 | 5210 | stop_pc = regcache_read_pc (get_thread_regcache (inferior_ptid)); |
fd664c91 | 5211 | observer_notify_no_history (); |
22bcd14b | 5212 | stop_waiting (ecs); |
b2175913 | 5213 | return; |
488f131b | 5214 | } |
4f5d7f63 PA |
5215 | } |
5216 | ||
0b6e5e10 JB |
5217 | /* A wrapper around handle_inferior_event_1, which also makes sure |
5218 | that all temporary struct value objects that were created during | |
5219 | the handling of the event get deleted at the end. */ | |
5220 | ||
5221 | static void | |
5222 | handle_inferior_event (struct execution_control_state *ecs) | |
5223 | { | |
5224 | struct value *mark = value_mark (); | |
5225 | ||
5226 | handle_inferior_event_1 (ecs); | |
5227 | /* Purge all temporary values created during the event handling, | |
5228 | as it could be a long time before we return to the command level | |
5229 | where such values would otherwise be purged. */ | |
5230 | value_free_to_mark (mark); | |
5231 | } | |
5232 | ||
372316f1 PA |
5233 | /* Restart threads back to what they were trying to do back when we |
5234 | paused them for an in-line step-over. The EVENT_THREAD thread is | |
5235 | ignored. */ | |
4d9d9d04 PA |
5236 | |
5237 | static void | |
372316f1 PA |
5238 | restart_threads (struct thread_info *event_thread) |
5239 | { | |
5240 | struct thread_info *tp; | |
5241 | struct thread_info *step_over = NULL; | |
5242 | ||
5243 | /* In case the instruction just stepped spawned a new thread. */ | |
5244 | update_thread_list (); | |
5245 | ||
5246 | ALL_NON_EXITED_THREADS (tp) | |
5247 | { | |
5248 | if (tp == event_thread) | |
5249 | { | |
5250 | if (debug_infrun) | |
5251 | fprintf_unfiltered (gdb_stdlog, | |
5252 | "infrun: restart threads: " | |
5253 | "[%s] is event thread\n", | |
5254 | target_pid_to_str (tp->ptid)); | |
5255 | continue; | |
5256 | } | |
5257 | ||
5258 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
5259 | { | |
5260 | if (debug_infrun) | |
5261 | fprintf_unfiltered (gdb_stdlog, | |
5262 | "infrun: restart threads: " | |
5263 | "[%s] not meant to be running\n", | |
5264 | target_pid_to_str (tp->ptid)); | |
5265 | continue; | |
5266 | } | |
5267 | ||
5268 | if (tp->resumed) | |
5269 | { | |
5270 | if (debug_infrun) | |
5271 | fprintf_unfiltered (gdb_stdlog, | |
5272 | "infrun: restart threads: [%s] resumed\n", | |
5273 | target_pid_to_str (tp->ptid)); | |
5274 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); | |
5275 | continue; | |
5276 | } | |
5277 | ||
5278 | if (thread_is_in_step_over_chain (tp)) | |
5279 | { | |
5280 | if (debug_infrun) | |
5281 | fprintf_unfiltered (gdb_stdlog, | |
5282 | "infrun: restart threads: " | |
5283 | "[%s] needs step-over\n", | |
5284 | target_pid_to_str (tp->ptid)); | |
5285 | gdb_assert (!tp->resumed); | |
5286 | continue; | |
5287 | } | |
5288 | ||
5289 | ||
5290 | if (tp->suspend.waitstatus_pending_p) | |
5291 | { | |
5292 | if (debug_infrun) | |
5293 | fprintf_unfiltered (gdb_stdlog, | |
5294 | "infrun: restart threads: " | |
5295 | "[%s] has pending status\n", | |
5296 | target_pid_to_str (tp->ptid)); | |
5297 | tp->resumed = 1; | |
5298 | continue; | |
5299 | } | |
5300 | ||
5301 | /* If some thread needs to start a step-over at this point, it | |
5302 | should still be in the step-over queue, and thus skipped | |
5303 | above. */ | |
5304 | if (thread_still_needs_step_over (tp)) | |
5305 | { | |
5306 | internal_error (__FILE__, __LINE__, | |
5307 | "thread [%s] needs a step-over, but not in " | |
5308 | "step-over queue\n", | |
5309 | target_pid_to_str (tp->ptid)); | |
5310 | } | |
5311 | ||
5312 | if (currently_stepping (tp)) | |
5313 | { | |
5314 | if (debug_infrun) | |
5315 | fprintf_unfiltered (gdb_stdlog, | |
5316 | "infrun: restart threads: [%s] was stepping\n", | |
5317 | target_pid_to_str (tp->ptid)); | |
5318 | keep_going_stepped_thread (tp); | |
5319 | } | |
5320 | else | |
5321 | { | |
5322 | struct execution_control_state ecss; | |
5323 | struct execution_control_state *ecs = &ecss; | |
5324 | ||
5325 | if (debug_infrun) | |
5326 | fprintf_unfiltered (gdb_stdlog, | |
5327 | "infrun: restart threads: [%s] continuing\n", | |
5328 | target_pid_to_str (tp->ptid)); | |
5329 | reset_ecs (ecs, tp); | |
5330 | switch_to_thread (tp->ptid); | |
5331 | keep_going_pass_signal (ecs); | |
5332 | } | |
5333 | } | |
5334 | } | |
5335 | ||
5336 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
5337 | a pending waitstatus. */ | |
5338 | ||
5339 | static int | |
5340 | resumed_thread_with_pending_status (struct thread_info *tp, | |
5341 | void *arg) | |
5342 | { | |
5343 | return (tp->resumed | |
5344 | && tp->suspend.waitstatus_pending_p); | |
5345 | } | |
5346 | ||
5347 | /* Called when we get an event that may finish an in-line or | |
5348 | out-of-line (displaced stepping) step-over started previously. | |
5349 | Return true if the event is processed and we should go back to the | |
5350 | event loop; false if the caller should continue processing the | |
5351 | event. */ | |
5352 | ||
5353 | static int | |
4d9d9d04 PA |
5354 | finish_step_over (struct execution_control_state *ecs) |
5355 | { | |
372316f1 PA |
5356 | int had_step_over_info; |
5357 | ||
4d9d9d04 PA |
5358 | displaced_step_fixup (ecs->ptid, |
5359 | ecs->event_thread->suspend.stop_signal); | |
5360 | ||
372316f1 PA |
5361 | had_step_over_info = step_over_info_valid_p (); |
5362 | ||
5363 | if (had_step_over_info) | |
4d9d9d04 PA |
5364 | { |
5365 | /* If we're stepping over a breakpoint with all threads locked, | |
5366 | then only the thread that was stepped should be reporting | |
5367 | back an event. */ | |
5368 | gdb_assert (ecs->event_thread->control.trap_expected); | |
5369 | ||
5370 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
5371 | clear_step_over_info (); | |
5372 | } | |
5373 | ||
fbea99ea | 5374 | if (!target_is_non_stop_p ()) |
372316f1 | 5375 | return 0; |
4d9d9d04 PA |
5376 | |
5377 | /* Start a new step-over in another thread if there's one that | |
5378 | needs it. */ | |
5379 | start_step_over (); | |
372316f1 PA |
5380 | |
5381 | /* If we were stepping over a breakpoint before, and haven't started | |
5382 | a new in-line step-over sequence, then restart all other threads | |
5383 | (except the event thread). We can't do this in all-stop, as then | |
5384 | e.g., we wouldn't be able to issue any other remote packet until | |
5385 | these other threads stop. */ | |
5386 | if (had_step_over_info && !step_over_info_valid_p ()) | |
5387 | { | |
5388 | struct thread_info *pending; | |
5389 | ||
5390 | /* If we only have threads with pending statuses, the restart | |
5391 | below won't restart any thread and so nothing re-inserts the | |
5392 | breakpoint we just stepped over. But we need it inserted | |
5393 | when we later process the pending events, otherwise if | |
5394 | another thread has a pending event for this breakpoint too, | |
5395 | we'd discard its event (because the breakpoint that | |
5396 | originally caused the event was no longer inserted). */ | |
5397 | context_switch (ecs->ptid); | |
5398 | insert_breakpoints (); | |
5399 | ||
5400 | restart_threads (ecs->event_thread); | |
5401 | ||
5402 | /* If we have events pending, go through handle_inferior_event | |
5403 | again, picking up a pending event at random. This avoids | |
5404 | thread starvation. */ | |
5405 | ||
5406 | /* But not if we just stepped over a watchpoint in order to let | |
5407 | the instruction execute so we can evaluate its expression. | |
5408 | The set of watchpoints that triggered is recorded in the | |
5409 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
5410 | If we processed another event first, that other event could | |
5411 | clobber this info. */ | |
5412 | if (ecs->event_thread->stepping_over_watchpoint) | |
5413 | return 0; | |
5414 | ||
5415 | pending = iterate_over_threads (resumed_thread_with_pending_status, | |
5416 | NULL); | |
5417 | if (pending != NULL) | |
5418 | { | |
5419 | struct thread_info *tp = ecs->event_thread; | |
5420 | struct regcache *regcache; | |
5421 | ||
5422 | if (debug_infrun) | |
5423 | { | |
5424 | fprintf_unfiltered (gdb_stdlog, | |
5425 | "infrun: found resumed threads with " | |
5426 | "pending events, saving status\n"); | |
5427 | } | |
5428 | ||
5429 | gdb_assert (pending != tp); | |
5430 | ||
5431 | /* Record the event thread's event for later. */ | |
5432 | save_waitstatus (tp, &ecs->ws); | |
5433 | /* This was cleared early, by handle_inferior_event. Set it | |
5434 | so this pending event is considered by | |
5435 | do_target_wait. */ | |
5436 | tp->resumed = 1; | |
5437 | ||
5438 | gdb_assert (!tp->executing); | |
5439 | ||
5440 | regcache = get_thread_regcache (tp->ptid); | |
5441 | tp->suspend.stop_pc = regcache_read_pc (regcache); | |
5442 | ||
5443 | if (debug_infrun) | |
5444 | { | |
5445 | fprintf_unfiltered (gdb_stdlog, | |
5446 | "infrun: saved stop_pc=%s for %s " | |
5447 | "(currently_stepping=%d)\n", | |
5448 | paddress (target_gdbarch (), | |
5449 | tp->suspend.stop_pc), | |
5450 | target_pid_to_str (tp->ptid), | |
5451 | currently_stepping (tp)); | |
5452 | } | |
5453 | ||
5454 | /* This in-line step-over finished; clear this so we won't | |
5455 | start a new one. This is what handle_signal_stop would | |
5456 | do, if we returned false. */ | |
5457 | tp->stepping_over_breakpoint = 0; | |
5458 | ||
5459 | /* Wake up the event loop again. */ | |
5460 | mark_async_event_handler (infrun_async_inferior_event_token); | |
5461 | ||
5462 | prepare_to_wait (ecs); | |
5463 | return 1; | |
5464 | } | |
5465 | } | |
5466 | ||
5467 | return 0; | |
4d9d9d04 PA |
5468 | } |
5469 | ||
4f5d7f63 PA |
5470 | /* Come here when the program has stopped with a signal. */ |
5471 | ||
5472 | static void | |
5473 | handle_signal_stop (struct execution_control_state *ecs) | |
5474 | { | |
5475 | struct frame_info *frame; | |
5476 | struct gdbarch *gdbarch; | |
5477 | int stopped_by_watchpoint; | |
5478 | enum stop_kind stop_soon; | |
5479 | int random_signal; | |
c906108c | 5480 | |
f0407826 DE |
5481 | gdb_assert (ecs->ws.kind == TARGET_WAITKIND_STOPPED); |
5482 | ||
5483 | /* Do we need to clean up the state of a thread that has | |
5484 | completed a displaced single-step? (Doing so usually affects | |
5485 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
5486 | if (finish_step_over (ecs)) |
5487 | return; | |
f0407826 DE |
5488 | |
5489 | /* If we either finished a single-step or hit a breakpoint, but | |
5490 | the user wanted this thread to be stopped, pretend we got a | |
5491 | SIG0 (generic unsignaled stop). */ | |
5492 | if (ecs->event_thread->stop_requested | |
5493 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
5494 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
237fc4c9 | 5495 | |
515630c5 | 5496 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
488f131b | 5497 | |
527159b7 | 5498 | if (debug_infrun) |
237fc4c9 | 5499 | { |
5af949e3 UW |
5500 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
5501 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
7f82dfc7 JK |
5502 | struct cleanup *old_chain = save_inferior_ptid (); |
5503 | ||
5504 | inferior_ptid = ecs->ptid; | |
5af949e3 UW |
5505 | |
5506 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = %s\n", | |
5507 | paddress (gdbarch, stop_pc)); | |
d92524f1 | 5508 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
5509 | { |
5510 | CORE_ADDR addr; | |
abbb1732 | 5511 | |
237fc4c9 PA |
5512 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped by watchpoint\n"); |
5513 | ||
5514 | if (target_stopped_data_address (¤t_target, &addr)) | |
5515 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
5516 | "infrun: stopped data address = %s\n", |
5517 | paddress (gdbarch, addr)); | |
237fc4c9 PA |
5518 | else |
5519 | fprintf_unfiltered (gdb_stdlog, | |
5520 | "infrun: (no data address available)\n"); | |
5521 | } | |
7f82dfc7 JK |
5522 | |
5523 | do_cleanups (old_chain); | |
237fc4c9 | 5524 | } |
527159b7 | 5525 | |
36fa8042 PA |
5526 | /* This is originated from start_remote(), start_inferior() and |
5527 | shared libraries hook functions. */ | |
5528 | stop_soon = get_inferior_stop_soon (ecs->ptid); | |
5529 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) | |
5530 | { | |
5531 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
5532 | context_switch (ecs->ptid); | |
5533 | if (debug_infrun) | |
5534 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
5535 | stop_print_frame = 1; | |
22bcd14b | 5536 | stop_waiting (ecs); |
36fa8042 PA |
5537 | return; |
5538 | } | |
5539 | ||
36fa8042 PA |
5540 | /* This originates from attach_command(). We need to overwrite |
5541 | the stop_signal here, because some kernels don't ignore a | |
5542 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
5543 | See more comments in inferior.h. On the other hand, if we | |
5544 | get a non-SIGSTOP, report it to the user - assume the backend | |
5545 | will handle the SIGSTOP if it should show up later. | |
5546 | ||
5547 | Also consider that the attach is complete when we see a | |
5548 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
5549 | target extended-remote report it instead of a SIGSTOP | |
5550 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
5551 | signal, so this is no exception. | |
5552 | ||
5553 | Also consider that the attach is complete when we see a | |
5554 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
5555 | the target to stop all threads of the inferior, in case the | |
5556 | low level attach operation doesn't stop them implicitly. If | |
5557 | they weren't stopped implicitly, then the stub will report a | |
5558 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
5559 | other than GDB's request. */ | |
5560 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5561 | && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP | |
5562 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5563 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0)) | |
5564 | { | |
5565 | stop_print_frame = 1; | |
22bcd14b | 5566 | stop_waiting (ecs); |
36fa8042 PA |
5567 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
5568 | return; | |
5569 | } | |
5570 | ||
488f131b | 5571 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
5572 | so, then switch to that thread. */ |
5573 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 5574 | { |
527159b7 | 5575 | if (debug_infrun) |
8a9de0e4 | 5576 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 5577 | |
0d1e5fa7 | 5578 | context_switch (ecs->ptid); |
c5aa993b | 5579 | |
9a4105ab AC |
5580 | if (deprecated_context_hook) |
5581 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
488f131b | 5582 | } |
c906108c | 5583 | |
568d6575 UW |
5584 | /* At this point, get hold of the now-current thread's frame. */ |
5585 | frame = get_current_frame (); | |
5586 | gdbarch = get_frame_arch (frame); | |
5587 | ||
2adfaa28 | 5588 | /* Pull the single step breakpoints out of the target. */ |
af48d08f | 5589 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
488f131b | 5590 | { |
af48d08f PA |
5591 | struct regcache *regcache; |
5592 | struct address_space *aspace; | |
5593 | CORE_ADDR pc; | |
2adfaa28 | 5594 | |
af48d08f PA |
5595 | regcache = get_thread_regcache (ecs->ptid); |
5596 | aspace = get_regcache_aspace (regcache); | |
5597 | pc = regcache_read_pc (regcache); | |
34b7e8a6 | 5598 | |
af48d08f PA |
5599 | /* However, before doing so, if this single-step breakpoint was |
5600 | actually for another thread, set this thread up for moving | |
5601 | past it. */ | |
5602 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
5603 | aspace, pc)) | |
5604 | { | |
5605 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 PA |
5606 | { |
5607 | if (debug_infrun) | |
5608 | { | |
5609 | fprintf_unfiltered (gdb_stdlog, | |
af48d08f | 5610 | "infrun: [%s] hit another thread's " |
34b7e8a6 PA |
5611 | "single-step breakpoint\n", |
5612 | target_pid_to_str (ecs->ptid)); | |
2adfaa28 | 5613 | } |
af48d08f PA |
5614 | ecs->hit_singlestep_breakpoint = 1; |
5615 | } | |
5616 | } | |
5617 | else | |
5618 | { | |
5619 | if (debug_infrun) | |
5620 | { | |
5621 | fprintf_unfiltered (gdb_stdlog, | |
5622 | "infrun: [%s] hit its " | |
5623 | "single-step breakpoint\n", | |
5624 | target_pid_to_str (ecs->ptid)); | |
2adfaa28 PA |
5625 | } |
5626 | } | |
488f131b | 5627 | } |
af48d08f | 5628 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 5629 | |
963f9c80 PA |
5630 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5631 | && ecs->event_thread->control.trap_expected | |
5632 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
5633 | stopped_by_watchpoint = 0; |
5634 | else | |
5635 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
5636 | ||
5637 | /* If necessary, step over this watchpoint. We'll be back to display | |
5638 | it in a moment. */ | |
5639 | if (stopped_by_watchpoint | |
d92524f1 | 5640 | && (target_have_steppable_watchpoint |
568d6575 | 5641 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 5642 | { |
488f131b JB |
5643 | /* At this point, we are stopped at an instruction which has |
5644 | attempted to write to a piece of memory under control of | |
5645 | a watchpoint. The instruction hasn't actually executed | |
5646 | yet. If we were to evaluate the watchpoint expression | |
5647 | now, we would get the old value, and therefore no change | |
5648 | would seem to have occurred. | |
5649 | ||
5650 | In order to make watchpoints work `right', we really need | |
5651 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
5652 | watchpoint expression. We do this by single-stepping the |
5653 | target. | |
5654 | ||
7f89fd65 | 5655 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
5656 | it. For example, the PA can (with some kernel cooperation) |
5657 | single step over a watchpoint without disabling the watchpoint. | |
5658 | ||
5659 | It is far more common to need to disable a watchpoint to step | |
5660 | the inferior over it. If we have non-steppable watchpoints, | |
5661 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
5662 | disable all watchpoints. |
5663 | ||
5664 | Any breakpoint at PC must also be stepped over -- if there's | |
5665 | one, it will have already triggered before the watchpoint | |
5666 | triggered, and we either already reported it to the user, or | |
5667 | it didn't cause a stop and we called keep_going. In either | |
5668 | case, if there was a breakpoint at PC, we must be trying to | |
5669 | step past it. */ | |
5670 | ecs->event_thread->stepping_over_watchpoint = 1; | |
5671 | keep_going (ecs); | |
488f131b JB |
5672 | return; |
5673 | } | |
5674 | ||
4e1c45ea | 5675 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 5676 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
5677 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
5678 | ecs->event_thread->control.stop_step = 0; | |
488f131b | 5679 | stop_print_frame = 1; |
488f131b | 5680 | stopped_by_random_signal = 0; |
488f131b | 5681 | |
edb3359d DJ |
5682 | /* Hide inlined functions starting here, unless we just performed stepi or |
5683 | nexti. After stepi and nexti, always show the innermost frame (not any | |
5684 | inline function call sites). */ | |
16c381f0 | 5685 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f GB |
5686 | { |
5687 | struct address_space *aspace = | |
5688 | get_regcache_aspace (get_thread_regcache (ecs->ptid)); | |
5689 | ||
5690 | /* skip_inline_frames is expensive, so we avoid it if we can | |
5691 | determine that the address is one where functions cannot have | |
5692 | been inlined. This improves performance with inferiors that | |
5693 | load a lot of shared libraries, because the solib event | |
5694 | breakpoint is defined as the address of a function (i.e. not | |
5695 | inline). Note that we have to check the previous PC as well | |
5696 | as the current one to catch cases when we have just | |
5697 | single-stepped off a breakpoint prior to reinstating it. | |
5698 | Note that we're assuming that the code we single-step to is | |
5699 | not inline, but that's not definitive: there's nothing | |
5700 | preventing the event breakpoint function from containing | |
5701 | inlined code, and the single-step ending up there. If the | |
5702 | user had set a breakpoint on that inlined code, the missing | |
5703 | skip_inline_frames call would break things. Fortunately | |
5704 | that's an extremely unlikely scenario. */ | |
09ac7c10 | 5705 | if (!pc_at_non_inline_function (aspace, stop_pc, &ecs->ws) |
a210c238 MR |
5706 | && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5707 | && ecs->event_thread->control.trap_expected | |
5708 | && pc_at_non_inline_function (aspace, | |
5709 | ecs->event_thread->prev_pc, | |
09ac7c10 | 5710 | &ecs->ws))) |
1c5a993e MR |
5711 | { |
5712 | skip_inline_frames (ecs->ptid); | |
5713 | ||
5714 | /* Re-fetch current thread's frame in case that invalidated | |
5715 | the frame cache. */ | |
5716 | frame = get_current_frame (); | |
5717 | gdbarch = get_frame_arch (frame); | |
5718 | } | |
0574c78f | 5719 | } |
edb3359d | 5720 | |
a493e3e2 | 5721 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 5722 | && ecs->event_thread->control.trap_expected |
568d6575 | 5723 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 5724 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 5725 | { |
b50d7442 | 5726 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 5727 | also on an instruction that needs to be stepped multiple |
1777feb0 | 5728 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
5729 | with a delay slot. It needs to be stepped twice, once for |
5730 | the instruction and once for the delay slot. */ | |
5731 | int step_through_delay | |
568d6575 | 5732 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 5733 | |
527159b7 | 5734 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 5735 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
16c381f0 JK |
5736 | if (ecs->event_thread->control.step_range_end == 0 |
5737 | && step_through_delay) | |
3352ef37 AC |
5738 | { |
5739 | /* The user issued a continue when stopped at a breakpoint. | |
5740 | Set up for another trap and get out of here. */ | |
4e1c45ea | 5741 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
5742 | keep_going (ecs); |
5743 | return; | |
5744 | } | |
5745 | else if (step_through_delay) | |
5746 | { | |
5747 | /* The user issued a step when stopped at a breakpoint. | |
5748 | Maybe we should stop, maybe we should not - the delay | |
5749 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
5750 | case, don't decide that here, just set |
5751 | ecs->stepping_over_breakpoint, making sure we | |
5752 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 5753 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
5754 | } |
5755 | } | |
5756 | ||
ab04a2af TT |
5757 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
5758 | handles this event. */ | |
5759 | ecs->event_thread->control.stop_bpstat | |
5760 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), | |
5761 | stop_pc, ecs->ptid, &ecs->ws); | |
db82e815 | 5762 | |
ab04a2af TT |
5763 | /* Following in case break condition called a |
5764 | function. */ | |
5765 | stop_print_frame = 1; | |
73dd234f | 5766 | |
ab04a2af TT |
5767 | /* This is where we handle "moribund" watchpoints. Unlike |
5768 | software breakpoints traps, hardware watchpoint traps are | |
5769 | always distinguishable from random traps. If no high-level | |
5770 | watchpoint is associated with the reported stop data address | |
5771 | anymore, then the bpstat does not explain the signal --- | |
5772 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
5773 | set. */ | |
5774 | ||
5775 | if (debug_infrun | |
5776 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
47591c29 | 5777 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 5778 | GDB_SIGNAL_TRAP) |
ab04a2af TT |
5779 | && stopped_by_watchpoint) |
5780 | fprintf_unfiltered (gdb_stdlog, | |
5781 | "infrun: no user watchpoint explains " | |
5782 | "watchpoint SIGTRAP, ignoring\n"); | |
73dd234f | 5783 | |
bac7d97b | 5784 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
5785 | at one stage in the past included checks for an inferior |
5786 | function call's call dummy's return breakpoint. The original | |
5787 | comment, that went with the test, read: | |
03cebad2 | 5788 | |
ab04a2af TT |
5789 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
5790 | another signal besides SIGTRAP, so check here as well as | |
5791 | above.'' | |
73dd234f | 5792 | |
ab04a2af TT |
5793 | If someone ever tries to get call dummys on a |
5794 | non-executable stack to work (where the target would stop | |
5795 | with something like a SIGSEGV), then those tests might need | |
5796 | to be re-instated. Given, however, that the tests were only | |
5797 | enabled when momentary breakpoints were not being used, I | |
5798 | suspect that it won't be the case. | |
488f131b | 5799 | |
ab04a2af TT |
5800 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
5801 | be necessary for call dummies on a non-executable stack on | |
5802 | SPARC. */ | |
488f131b | 5803 | |
bac7d97b | 5804 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
5805 | random_signal |
5806 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
5807 | ecs->event_thread->suspend.stop_signal); | |
bac7d97b | 5808 | |
1cf4d951 PA |
5809 | /* Maybe this was a trap for a software breakpoint that has since |
5810 | been removed. */ | |
5811 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
5812 | { | |
5813 | if (program_breakpoint_here_p (gdbarch, stop_pc)) | |
5814 | { | |
5815 | struct regcache *regcache; | |
5816 | int decr_pc; | |
5817 | ||
5818 | /* Re-adjust PC to what the program would see if GDB was not | |
5819 | debugging it. */ | |
5820 | regcache = get_thread_regcache (ecs->event_thread->ptid); | |
527a273a | 5821 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
5822 | if (decr_pc != 0) |
5823 | { | |
5824 | struct cleanup *old_cleanups = make_cleanup (null_cleanup, NULL); | |
5825 | ||
5826 | if (record_full_is_used ()) | |
5827 | record_full_gdb_operation_disable_set (); | |
5828 | ||
5829 | regcache_write_pc (regcache, stop_pc + decr_pc); | |
5830 | ||
5831 | do_cleanups (old_cleanups); | |
5832 | } | |
5833 | } | |
5834 | else | |
5835 | { | |
5836 | /* A delayed software breakpoint event. Ignore the trap. */ | |
5837 | if (debug_infrun) | |
5838 | fprintf_unfiltered (gdb_stdlog, | |
5839 | "infrun: delayed software breakpoint " | |
5840 | "trap, ignoring\n"); | |
5841 | random_signal = 0; | |
5842 | } | |
5843 | } | |
5844 | ||
5845 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
5846 | has since been removed. */ | |
5847 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
5848 | { | |
5849 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
5850 | if (debug_infrun) | |
5851 | fprintf_unfiltered (gdb_stdlog, | |
5852 | "infrun: delayed hardware breakpoint/watchpoint " | |
5853 | "trap, ignoring\n"); | |
5854 | random_signal = 0; | |
5855 | } | |
5856 | ||
bac7d97b PA |
5857 | /* If not, perhaps stepping/nexting can. */ |
5858 | if (random_signal) | |
5859 | random_signal = !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5860 | && currently_stepping (ecs->event_thread)); | |
ab04a2af | 5861 | |
2adfaa28 PA |
5862 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
5863 | thread. Single-step breakpoints are transparent to the | |
5864 | breakpoints module. */ | |
5865 | if (random_signal) | |
5866 | random_signal = !ecs->hit_singlestep_breakpoint; | |
5867 | ||
bac7d97b PA |
5868 | /* No? Perhaps we got a moribund watchpoint. */ |
5869 | if (random_signal) | |
5870 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 5871 | |
488f131b JB |
5872 | /* For the program's own signals, act according to |
5873 | the signal handling tables. */ | |
5874 | ||
ce12b012 | 5875 | if (random_signal) |
488f131b JB |
5876 | { |
5877 | /* Signal not for debugging purposes. */ | |
c9657e70 | 5878 | struct inferior *inf = find_inferior_ptid (ecs->ptid); |
c9737c08 | 5879 | enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal; |
488f131b | 5880 | |
527159b7 | 5881 | if (debug_infrun) |
c9737c08 PA |
5882 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal (%s)\n", |
5883 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 5884 | |
488f131b JB |
5885 | stopped_by_random_signal = 1; |
5886 | ||
252fbfc8 PA |
5887 | /* Always stop on signals if we're either just gaining control |
5888 | of the program, or the user explicitly requested this thread | |
5889 | to remain stopped. */ | |
d6b48e9c | 5890 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 5891 | || ecs->event_thread->stop_requested |
24291992 | 5892 | || (!inf->detaching |
16c381f0 | 5893 | && signal_stop_state (ecs->event_thread->suspend.stop_signal))) |
488f131b | 5894 | { |
22bcd14b | 5895 | stop_waiting (ecs); |
488f131b JB |
5896 | return; |
5897 | } | |
b57bacec PA |
5898 | |
5899 | /* Notify observers the signal has "handle print" set. Note we | |
5900 | returned early above if stopping; normal_stop handles the | |
5901 | printing in that case. */ | |
5902 | if (signal_print[ecs->event_thread->suspend.stop_signal]) | |
5903 | { | |
5904 | /* The signal table tells us to print about this signal. */ | |
5905 | target_terminal_ours_for_output (); | |
5906 | observer_notify_signal_received (ecs->event_thread->suspend.stop_signal); | |
5907 | target_terminal_inferior (); | |
5908 | } | |
488f131b JB |
5909 | |
5910 | /* Clear the signal if it should not be passed. */ | |
16c381f0 | 5911 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
a493e3e2 | 5912 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
488f131b | 5913 | |
fb14de7b | 5914 | if (ecs->event_thread->prev_pc == stop_pc |
16c381f0 | 5915 | && ecs->event_thread->control.trap_expected |
8358c15c | 5916 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 | 5917 | { |
372316f1 PA |
5918 | int was_in_line; |
5919 | ||
68f53502 AC |
5920 | /* We were just starting a new sequence, attempting to |
5921 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 5922 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
5923 | of the stepping range so GDB needs to remember to, when |
5924 | the signal handler returns, resume stepping off that | |
5925 | breakpoint. */ | |
5926 | /* To simplify things, "continue" is forced to use the same | |
5927 | code paths as single-step - set a breakpoint at the | |
5928 | signal return address and then, once hit, step off that | |
5929 | breakpoint. */ | |
237fc4c9 PA |
5930 | if (debug_infrun) |
5931 | fprintf_unfiltered (gdb_stdlog, | |
5932 | "infrun: signal arrived while stepping over " | |
5933 | "breakpoint\n"); | |
d3169d93 | 5934 | |
372316f1 PA |
5935 | was_in_line = step_over_info_valid_p (); |
5936 | clear_step_over_info (); | |
2c03e5be | 5937 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 5938 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
5939 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
5940 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc | 5941 | |
fbea99ea | 5942 | if (target_is_non_stop_p ()) |
372316f1 | 5943 | { |
fbea99ea PA |
5944 | /* Either "set non-stop" is "on", or the target is |
5945 | always in non-stop mode. In this case, we have a bit | |
5946 | more work to do. Resume the current thread, and if | |
5947 | we had paused all threads, restart them while the | |
5948 | signal handler runs. */ | |
372316f1 PA |
5949 | keep_going (ecs); |
5950 | ||
372316f1 PA |
5951 | if (was_in_line) |
5952 | { | |
372316f1 PA |
5953 | restart_threads (ecs->event_thread); |
5954 | } | |
5955 | else if (debug_infrun) | |
5956 | { | |
5957 | fprintf_unfiltered (gdb_stdlog, | |
5958 | "infrun: no need to restart threads\n"); | |
5959 | } | |
5960 | return; | |
5961 | } | |
5962 | ||
d137e6dc PA |
5963 | /* If we were nexting/stepping some other thread, switch to |
5964 | it, so that we don't continue it, losing control. */ | |
5965 | if (!switch_back_to_stepped_thread (ecs)) | |
5966 | keep_going (ecs); | |
9d799f85 | 5967 | return; |
68f53502 | 5968 | } |
9d799f85 | 5969 | |
e5f8a7cc PA |
5970 | if (ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0 |
5971 | && (pc_in_thread_step_range (stop_pc, ecs->event_thread) | |
5972 | || ecs->event_thread->control.step_range_end == 1) | |
edb3359d | 5973 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 5974 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 5975 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
5976 | { |
5977 | /* The inferior is about to take a signal that will take it | |
5978 | out of the single step range. Set a breakpoint at the | |
5979 | current PC (which is presumably where the signal handler | |
5980 | will eventually return) and then allow the inferior to | |
5981 | run free. | |
5982 | ||
5983 | Note that this is only needed for a signal delivered | |
5984 | while in the single-step range. Nested signals aren't a | |
5985 | problem as they eventually all return. */ | |
237fc4c9 PA |
5986 | if (debug_infrun) |
5987 | fprintf_unfiltered (gdb_stdlog, | |
5988 | "infrun: signal may take us out of " | |
5989 | "single-step range\n"); | |
5990 | ||
372316f1 | 5991 | clear_step_over_info (); |
2c03e5be | 5992 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 5993 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
5994 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
5995 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
5996 | keep_going (ecs); |
5997 | return; | |
d303a6c7 | 5998 | } |
9d799f85 AC |
5999 | |
6000 | /* Note: step_resume_breakpoint may be non-NULL. This occures | |
6001 | when either there's a nested signal, or when there's a | |
6002 | pending signal enabled just as the signal handler returns | |
6003 | (leaving the inferior at the step-resume-breakpoint without | |
6004 | actually executing it). Either way continue until the | |
6005 | breakpoint is really hit. */ | |
c447ac0b PA |
6006 | |
6007 | if (!switch_back_to_stepped_thread (ecs)) | |
6008 | { | |
6009 | if (debug_infrun) | |
6010 | fprintf_unfiltered (gdb_stdlog, | |
6011 | "infrun: random signal, keep going\n"); | |
6012 | ||
6013 | keep_going (ecs); | |
6014 | } | |
6015 | return; | |
488f131b | 6016 | } |
94c57d6a PA |
6017 | |
6018 | process_event_stop_test (ecs); | |
6019 | } | |
6020 | ||
6021 | /* Come here when we've got some debug event / signal we can explain | |
6022 | (IOW, not a random signal), and test whether it should cause a | |
6023 | stop, or whether we should resume the inferior (transparently). | |
6024 | E.g., could be a breakpoint whose condition evaluates false; we | |
6025 | could be still stepping within the line; etc. */ | |
6026 | ||
6027 | static void | |
6028 | process_event_stop_test (struct execution_control_state *ecs) | |
6029 | { | |
6030 | struct symtab_and_line stop_pc_sal; | |
6031 | struct frame_info *frame; | |
6032 | struct gdbarch *gdbarch; | |
cdaa5b73 PA |
6033 | CORE_ADDR jmp_buf_pc; |
6034 | struct bpstat_what what; | |
94c57d6a | 6035 | |
cdaa5b73 | 6036 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 6037 | |
cdaa5b73 PA |
6038 | frame = get_current_frame (); |
6039 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 6040 | |
cdaa5b73 | 6041 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 6042 | |
cdaa5b73 PA |
6043 | if (what.call_dummy) |
6044 | { | |
6045 | stop_stack_dummy = what.call_dummy; | |
6046 | } | |
186c406b | 6047 | |
243a9253 PA |
6048 | /* A few breakpoint types have callbacks associated (e.g., |
6049 | bp_jit_event). Run them now. */ | |
6050 | bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat); | |
6051 | ||
cdaa5b73 PA |
6052 | /* If we hit an internal event that triggers symbol changes, the |
6053 | current frame will be invalidated within bpstat_what (e.g., if we | |
6054 | hit an internal solib event). Re-fetch it. */ | |
6055 | frame = get_current_frame (); | |
6056 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 6057 | |
cdaa5b73 PA |
6058 | switch (what.main_action) |
6059 | { | |
6060 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
6061 | /* If we hit the breakpoint at longjmp while stepping, we | |
6062 | install a momentary breakpoint at the target of the | |
6063 | jmp_buf. */ | |
186c406b | 6064 | |
cdaa5b73 PA |
6065 | if (debug_infrun) |
6066 | fprintf_unfiltered (gdb_stdlog, | |
6067 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); | |
186c406b | 6068 | |
cdaa5b73 | 6069 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 6070 | |
cdaa5b73 PA |
6071 | if (what.is_longjmp) |
6072 | { | |
6073 | struct value *arg_value; | |
6074 | ||
6075 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
6076 | then use it to extract the arguments. The destination PC | |
6077 | is the third argument to the probe. */ | |
6078 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
6079 | if (arg_value) | |
8fa0c4f8 AA |
6080 | { |
6081 | jmp_buf_pc = value_as_address (arg_value); | |
6082 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
6083 | } | |
cdaa5b73 PA |
6084 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
6085 | || !gdbarch_get_longjmp_target (gdbarch, | |
6086 | frame, &jmp_buf_pc)) | |
e2e4d78b | 6087 | { |
cdaa5b73 PA |
6088 | if (debug_infrun) |
6089 | fprintf_unfiltered (gdb_stdlog, | |
6090 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME " | |
6091 | "(!gdbarch_get_longjmp_target)\n"); | |
6092 | keep_going (ecs); | |
6093 | return; | |
e2e4d78b | 6094 | } |
e2e4d78b | 6095 | |
cdaa5b73 PA |
6096 | /* Insert a breakpoint at resume address. */ |
6097 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
6098 | } | |
6099 | else | |
6100 | check_exception_resume (ecs, frame); | |
6101 | keep_going (ecs); | |
6102 | return; | |
e81a37f7 | 6103 | |
cdaa5b73 PA |
6104 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
6105 | { | |
6106 | struct frame_info *init_frame; | |
e81a37f7 | 6107 | |
cdaa5b73 | 6108 | /* There are several cases to consider. |
c906108c | 6109 | |
cdaa5b73 PA |
6110 | 1. The initiating frame no longer exists. In this case we |
6111 | must stop, because the exception or longjmp has gone too | |
6112 | far. | |
2c03e5be | 6113 | |
cdaa5b73 PA |
6114 | 2. The initiating frame exists, and is the same as the |
6115 | current frame. We stop, because the exception or longjmp | |
6116 | has been caught. | |
2c03e5be | 6117 | |
cdaa5b73 PA |
6118 | 3. The initiating frame exists and is different from the |
6119 | current frame. This means the exception or longjmp has | |
6120 | been caught beneath the initiating frame, so keep going. | |
c906108c | 6121 | |
cdaa5b73 PA |
6122 | 4. longjmp breakpoint has been placed just to protect |
6123 | against stale dummy frames and user is not interested in | |
6124 | stopping around longjmps. */ | |
c5aa993b | 6125 | |
cdaa5b73 PA |
6126 | if (debug_infrun) |
6127 | fprintf_unfiltered (gdb_stdlog, | |
6128 | "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); | |
c5aa993b | 6129 | |
cdaa5b73 PA |
6130 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
6131 | != NULL); | |
6132 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 6133 | |
cdaa5b73 PA |
6134 | if (what.is_longjmp) |
6135 | { | |
b67a2c6f | 6136 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 6137 | |
cdaa5b73 | 6138 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 6139 | { |
cdaa5b73 PA |
6140 | /* Case 4. */ |
6141 | keep_going (ecs); | |
6142 | return; | |
e5ef252a | 6143 | } |
cdaa5b73 | 6144 | } |
c5aa993b | 6145 | |
cdaa5b73 | 6146 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 6147 | |
cdaa5b73 PA |
6148 | if (init_frame) |
6149 | { | |
6150 | struct frame_id current_id | |
6151 | = get_frame_id (get_current_frame ()); | |
6152 | if (frame_id_eq (current_id, | |
6153 | ecs->event_thread->initiating_frame)) | |
6154 | { | |
6155 | /* Case 2. Fall through. */ | |
6156 | } | |
6157 | else | |
6158 | { | |
6159 | /* Case 3. */ | |
6160 | keep_going (ecs); | |
6161 | return; | |
6162 | } | |
68f53502 | 6163 | } |
488f131b | 6164 | |
cdaa5b73 PA |
6165 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
6166 | exists. */ | |
6167 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 6168 | |
bdc36728 | 6169 | end_stepping_range (ecs); |
cdaa5b73 PA |
6170 | } |
6171 | return; | |
e5ef252a | 6172 | |
cdaa5b73 PA |
6173 | case BPSTAT_WHAT_SINGLE: |
6174 | if (debug_infrun) | |
6175 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); | |
6176 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6177 | /* Still need to check other stuff, at least the case where we | |
6178 | are stepping and step out of the right range. */ | |
6179 | break; | |
e5ef252a | 6180 | |
cdaa5b73 PA |
6181 | case BPSTAT_WHAT_STEP_RESUME: |
6182 | if (debug_infrun) | |
6183 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); | |
e5ef252a | 6184 | |
cdaa5b73 PA |
6185 | delete_step_resume_breakpoint (ecs->event_thread); |
6186 | if (ecs->event_thread->control.proceed_to_finish | |
6187 | && execution_direction == EXEC_REVERSE) | |
6188 | { | |
6189 | struct thread_info *tp = ecs->event_thread; | |
6190 | ||
6191 | /* We are finishing a function in reverse, and just hit the | |
6192 | step-resume breakpoint at the start address of the | |
6193 | function, and we're almost there -- just need to back up | |
6194 | by one more single-step, which should take us back to the | |
6195 | function call. */ | |
6196 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
6197 | keep_going (ecs); | |
e5ef252a | 6198 | return; |
cdaa5b73 PA |
6199 | } |
6200 | fill_in_stop_func (gdbarch, ecs); | |
6201 | if (stop_pc == ecs->stop_func_start | |
6202 | && execution_direction == EXEC_REVERSE) | |
6203 | { | |
6204 | /* We are stepping over a function call in reverse, and just | |
6205 | hit the step-resume breakpoint at the start address of | |
6206 | the function. Go back to single-stepping, which should | |
6207 | take us back to the function call. */ | |
6208 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6209 | keep_going (ecs); | |
6210 | return; | |
6211 | } | |
6212 | break; | |
e5ef252a | 6213 | |
cdaa5b73 PA |
6214 | case BPSTAT_WHAT_STOP_NOISY: |
6215 | if (debug_infrun) | |
6216 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); | |
6217 | stop_print_frame = 1; | |
e5ef252a | 6218 | |
99619bea PA |
6219 | /* Assume the thread stopped for a breapoint. We'll still check |
6220 | whether a/the breakpoint is there when the thread is next | |
6221 | resumed. */ | |
6222 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 6223 | |
22bcd14b | 6224 | stop_waiting (ecs); |
cdaa5b73 | 6225 | return; |
e5ef252a | 6226 | |
cdaa5b73 PA |
6227 | case BPSTAT_WHAT_STOP_SILENT: |
6228 | if (debug_infrun) | |
6229 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); | |
6230 | stop_print_frame = 0; | |
e5ef252a | 6231 | |
99619bea PA |
6232 | /* Assume the thread stopped for a breapoint. We'll still check |
6233 | whether a/the breakpoint is there when the thread is next | |
6234 | resumed. */ | |
6235 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 6236 | stop_waiting (ecs); |
cdaa5b73 PA |
6237 | return; |
6238 | ||
6239 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
6240 | if (debug_infrun) | |
6241 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_HP_STEP_RESUME\n"); | |
6242 | ||
6243 | delete_step_resume_breakpoint (ecs->event_thread); | |
6244 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
6245 | { | |
6246 | /* Back when the step-resume breakpoint was inserted, we | |
6247 | were trying to single-step off a breakpoint. Go back to | |
6248 | doing that. */ | |
6249 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6250 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6251 | keep_going (ecs); | |
6252 | return; | |
e5ef252a | 6253 | } |
cdaa5b73 PA |
6254 | break; |
6255 | ||
6256 | case BPSTAT_WHAT_KEEP_CHECKING: | |
6257 | break; | |
e5ef252a | 6258 | } |
c906108c | 6259 | |
af48d08f PA |
6260 | /* If we stepped a permanent breakpoint and we had a high priority |
6261 | step-resume breakpoint for the address we stepped, but we didn't | |
6262 | hit it, then we must have stepped into the signal handler. The | |
6263 | step-resume was only necessary to catch the case of _not_ | |
6264 | stepping into the handler, so delete it, and fall through to | |
6265 | checking whether the step finished. */ | |
6266 | if (ecs->event_thread->stepped_breakpoint) | |
6267 | { | |
6268 | struct breakpoint *sr_bp | |
6269 | = ecs->event_thread->control.step_resume_breakpoint; | |
6270 | ||
8d707a12 PA |
6271 | if (sr_bp != NULL |
6272 | && sr_bp->loc->permanent | |
af48d08f PA |
6273 | && sr_bp->type == bp_hp_step_resume |
6274 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
6275 | { | |
6276 | if (debug_infrun) | |
6277 | fprintf_unfiltered (gdb_stdlog, | |
6278 | "infrun: stepped permanent breakpoint, stopped in " | |
6279 | "handler\n"); | |
6280 | delete_step_resume_breakpoint (ecs->event_thread); | |
6281 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6282 | } | |
6283 | } | |
6284 | ||
cdaa5b73 PA |
6285 | /* We come here if we hit a breakpoint but should not stop for it. |
6286 | Possibly we also were stepping and should stop for that. So fall | |
6287 | through and test for stepping. But, if not stepping, do not | |
6288 | stop. */ | |
c906108c | 6289 | |
a7212384 UW |
6290 | /* In all-stop mode, if we're currently stepping but have stopped in |
6291 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
6292 | if (switch_back_to_stepped_thread (ecs)) |
6293 | return; | |
776f04fa | 6294 | |
8358c15c | 6295 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 6296 | { |
527159b7 | 6297 | if (debug_infrun) |
d3169d93 DJ |
6298 | fprintf_unfiltered (gdb_stdlog, |
6299 | "infrun: step-resume breakpoint is inserted\n"); | |
527159b7 | 6300 | |
488f131b JB |
6301 | /* Having a step-resume breakpoint overrides anything |
6302 | else having to do with stepping commands until | |
6303 | that breakpoint is reached. */ | |
488f131b JB |
6304 | keep_going (ecs); |
6305 | return; | |
6306 | } | |
c5aa993b | 6307 | |
16c381f0 | 6308 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 6309 | { |
527159b7 | 6310 | if (debug_infrun) |
8a9de0e4 | 6311 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 6312 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
6313 | keep_going (ecs); |
6314 | return; | |
6315 | } | |
c5aa993b | 6316 | |
4b7703ad JB |
6317 | /* Re-fetch current thread's frame in case the code above caused |
6318 | the frame cache to be re-initialized, making our FRAME variable | |
6319 | a dangling pointer. */ | |
6320 | frame = get_current_frame (); | |
628fe4e4 | 6321 | gdbarch = get_frame_arch (frame); |
7e324e48 | 6322 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 6323 | |
488f131b | 6324 | /* If stepping through a line, keep going if still within it. |
c906108c | 6325 | |
488f131b JB |
6326 | Note that step_range_end is the address of the first instruction |
6327 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
6328 | within it! |
6329 | ||
6330 | Note also that during reverse execution, we may be stepping | |
6331 | through a function epilogue and therefore must detect when | |
6332 | the current-frame changes in the middle of a line. */ | |
6333 | ||
ce4c476a | 6334 | if (pc_in_thread_step_range (stop_pc, ecs->event_thread) |
31410e84 | 6335 | && (execution_direction != EXEC_REVERSE |
388a8562 | 6336 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 6337 | ecs->event_thread->control.step_frame_id))) |
488f131b | 6338 | { |
527159b7 | 6339 | if (debug_infrun) |
5af949e3 UW |
6340 | fprintf_unfiltered |
6341 | (gdb_stdlog, "infrun: stepping inside range [%s-%s]\n", | |
16c381f0 JK |
6342 | paddress (gdbarch, ecs->event_thread->control.step_range_start), |
6343 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 6344 | |
c1e36e3e PA |
6345 | /* Tentatively re-enable range stepping; `resume' disables it if |
6346 | necessary (e.g., if we're stepping over a breakpoint or we | |
6347 | have software watchpoints). */ | |
6348 | ecs->event_thread->control.may_range_step = 1; | |
6349 | ||
b2175913 MS |
6350 | /* When stepping backward, stop at beginning of line range |
6351 | (unless it's the function entry point, in which case | |
6352 | keep going back to the call point). */ | |
16c381f0 | 6353 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
6354 | && stop_pc != ecs->stop_func_start |
6355 | && execution_direction == EXEC_REVERSE) | |
bdc36728 | 6356 | end_stepping_range (ecs); |
b2175913 MS |
6357 | else |
6358 | keep_going (ecs); | |
6359 | ||
488f131b JB |
6360 | return; |
6361 | } | |
c5aa993b | 6362 | |
488f131b | 6363 | /* We stepped out of the stepping range. */ |
c906108c | 6364 | |
488f131b | 6365 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
6366 | loader dynamic symbol resolution code... |
6367 | ||
6368 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
6369 | time loader code and reach the callee's address. | |
6370 | ||
6371 | EXEC_REVERSE: we've already executed the callee (backward), and | |
6372 | the runtime loader code is handled just like any other | |
6373 | undebuggable function call. Now we need only keep stepping | |
6374 | backward through the trampoline code, and that's handled further | |
6375 | down, so there is nothing for us to do here. */ | |
6376 | ||
6377 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 6378 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
cfd8ab24 | 6379 | && in_solib_dynsym_resolve_code (stop_pc)) |
488f131b | 6380 | { |
4c8c40e6 | 6381 | CORE_ADDR pc_after_resolver = |
568d6575 | 6382 | gdbarch_skip_solib_resolver (gdbarch, stop_pc); |
c906108c | 6383 | |
527159b7 | 6384 | if (debug_infrun) |
3e43a32a MS |
6385 | fprintf_unfiltered (gdb_stdlog, |
6386 | "infrun: stepped into dynsym resolve code\n"); | |
527159b7 | 6387 | |
488f131b JB |
6388 | if (pc_after_resolver) |
6389 | { | |
6390 | /* Set up a step-resume breakpoint at the address | |
6391 | indicated by SKIP_SOLIB_RESOLVER. */ | |
6392 | struct symtab_and_line sr_sal; | |
abbb1732 | 6393 | |
fe39c653 | 6394 | init_sal (&sr_sal); |
488f131b | 6395 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 6396 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 6397 | |
a6d9a66e UW |
6398 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6399 | sr_sal, null_frame_id); | |
c5aa993b | 6400 | } |
c906108c | 6401 | |
488f131b JB |
6402 | keep_going (ecs); |
6403 | return; | |
6404 | } | |
c906108c | 6405 | |
16c381f0 JK |
6406 | if (ecs->event_thread->control.step_range_end != 1 |
6407 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
6408 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 6409 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 6410 | { |
527159b7 | 6411 | if (debug_infrun) |
3e43a32a MS |
6412 | fprintf_unfiltered (gdb_stdlog, |
6413 | "infrun: stepped into signal trampoline\n"); | |
42edda50 | 6414 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
6415 | a signal trampoline (either by a signal being delivered or by |
6416 | the signal handler returning). Just single-step until the | |
6417 | inferior leaves the trampoline (either by calling the handler | |
6418 | or returning). */ | |
488f131b JB |
6419 | keep_going (ecs); |
6420 | return; | |
6421 | } | |
c906108c | 6422 | |
14132e89 MR |
6423 | /* If we're in the return path from a shared library trampoline, |
6424 | we want to proceed through the trampoline when stepping. */ | |
6425 | /* macro/2012-04-25: This needs to come before the subroutine | |
6426 | call check below as on some targets return trampolines look | |
6427 | like subroutine calls (MIPS16 return thunks). */ | |
6428 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
6429 | stop_pc, ecs->stop_func_name) | |
6430 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) | |
6431 | { | |
6432 | /* Determine where this trampoline returns. */ | |
6433 | CORE_ADDR real_stop_pc; | |
6434 | ||
6435 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
6436 | ||
6437 | if (debug_infrun) | |
6438 | fprintf_unfiltered (gdb_stdlog, | |
6439 | "infrun: stepped into solib return tramp\n"); | |
6440 | ||
6441 | /* Only proceed through if we know where it's going. */ | |
6442 | if (real_stop_pc) | |
6443 | { | |
6444 | /* And put the step-breakpoint there and go until there. */ | |
6445 | struct symtab_and_line sr_sal; | |
6446 | ||
6447 | init_sal (&sr_sal); /* initialize to zeroes */ | |
6448 | sr_sal.pc = real_stop_pc; | |
6449 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
6450 | sr_sal.pspace = get_frame_program_space (frame); | |
6451 | ||
6452 | /* Do not specify what the fp should be when we stop since | |
6453 | on some machines the prologue is where the new fp value | |
6454 | is established. */ | |
6455 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6456 | sr_sal, null_frame_id); | |
6457 | ||
6458 | /* Restart without fiddling with the step ranges or | |
6459 | other state. */ | |
6460 | keep_going (ecs); | |
6461 | return; | |
6462 | } | |
6463 | } | |
6464 | ||
c17eaafe DJ |
6465 | /* Check for subroutine calls. The check for the current frame |
6466 | equalling the step ID is not necessary - the check of the | |
6467 | previous frame's ID is sufficient - but it is a common case and | |
6468 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
6469 | |
6470 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
6471 | being equal, so to get into this block, both the current and | |
6472 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
6473 | /* The outer_frame_id check is a heuristic to detect stepping |
6474 | through startup code. If we step over an instruction which | |
6475 | sets the stack pointer from an invalid value to a valid value, | |
6476 | we may detect that as a subroutine call from the mythical | |
6477 | "outermost" function. This could be fixed by marking | |
6478 | outermost frames as !stack_p,code_p,special_p. Then the | |
6479 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 6480 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 6481 | for more. */ |
edb3359d | 6482 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6483 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 6484 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
6485 | ecs->event_thread->control.step_stack_frame_id) |
6486 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a | 6487 | outer_frame_id) |
885eeb5b PA |
6488 | || (ecs->event_thread->control.step_start_function |
6489 | != find_pc_function (stop_pc))))) | |
488f131b | 6490 | { |
95918acb | 6491 | CORE_ADDR real_stop_pc; |
8fb3e588 | 6492 | |
527159b7 | 6493 | if (debug_infrun) |
8a9de0e4 | 6494 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 6495 | |
b7a084be | 6496 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
6497 | { |
6498 | /* I presume that step_over_calls is only 0 when we're | |
6499 | supposed to be stepping at the assembly language level | |
6500 | ("stepi"). Just stop. */ | |
388a8562 | 6501 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 6502 | end_stepping_range (ecs); |
95918acb AC |
6503 | return; |
6504 | } | |
8fb3e588 | 6505 | |
388a8562 MS |
6506 | /* Reverse stepping through solib trampolines. */ |
6507 | ||
6508 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6509 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
6510 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6511 | || (ecs->stop_func_start == 0 | |
6512 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
6513 | { | |
6514 | /* Any solib trampoline code can be handled in reverse | |
6515 | by simply continuing to single-step. We have already | |
6516 | executed the solib function (backwards), and a few | |
6517 | steps will take us back through the trampoline to the | |
6518 | caller. */ | |
6519 | keep_going (ecs); | |
6520 | return; | |
6521 | } | |
6522 | ||
16c381f0 | 6523 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 6524 | { |
b2175913 MS |
6525 | /* We're doing a "next". |
6526 | ||
6527 | Normal (forward) execution: set a breakpoint at the | |
6528 | callee's return address (the address at which the caller | |
6529 | will resume). | |
6530 | ||
6531 | Reverse (backward) execution. set the step-resume | |
6532 | breakpoint at the start of the function that we just | |
6533 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 6534 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
6535 | |
6536 | if (execution_direction == EXEC_REVERSE) | |
6537 | { | |
acf9414f JK |
6538 | /* If we're already at the start of the function, we've either |
6539 | just stepped backward into a single instruction function, | |
6540 | or stepped back out of a signal handler to the first instruction | |
6541 | of the function. Just keep going, which will single-step back | |
6542 | to the caller. */ | |
58c48e72 | 6543 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f JK |
6544 | { |
6545 | struct symtab_and_line sr_sal; | |
6546 | ||
6547 | /* Normal function call return (static or dynamic). */ | |
6548 | init_sal (&sr_sal); | |
6549 | sr_sal.pc = ecs->stop_func_start; | |
6550 | sr_sal.pspace = get_frame_program_space (frame); | |
6551 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6552 | sr_sal, null_frame_id); | |
6553 | } | |
b2175913 MS |
6554 | } |
6555 | else | |
568d6575 | 6556 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6557 | |
8567c30f AC |
6558 | keep_going (ecs); |
6559 | return; | |
6560 | } | |
a53c66de | 6561 | |
95918acb | 6562 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
6563 | calling routine and the real function), locate the real |
6564 | function. That's what tells us (a) whether we want to step | |
6565 | into it at all, and (b) what prologue we want to run to the | |
6566 | end of, if we do step into it. */ | |
568d6575 | 6567 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 6568 | if (real_stop_pc == 0) |
568d6575 | 6569 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
6570 | if (real_stop_pc != 0) |
6571 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 6572 | |
db5f024e | 6573 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 RC |
6574 | { |
6575 | struct symtab_and_line sr_sal; | |
abbb1732 | 6576 | |
1b2bfbb9 RC |
6577 | init_sal (&sr_sal); |
6578 | sr_sal.pc = ecs->stop_func_start; | |
6c95b8df | 6579 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 6580 | |
a6d9a66e UW |
6581 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6582 | sr_sal, null_frame_id); | |
8fb3e588 AC |
6583 | keep_going (ecs); |
6584 | return; | |
1b2bfbb9 RC |
6585 | } |
6586 | ||
95918acb | 6587 | /* If we have line number information for the function we are |
1bfeeb0f JL |
6588 | thinking of stepping into and the function isn't on the skip |
6589 | list, step into it. | |
95918acb | 6590 | |
8fb3e588 AC |
6591 | If there are several symtabs at that PC (e.g. with include |
6592 | files), just want to know whether *any* of them have line | |
6593 | numbers. find_pc_line handles this. */ | |
95918acb AC |
6594 | { |
6595 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 6596 | |
95918acb | 6597 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 6598 | if (tmp_sal.line != 0 |
85817405 JK |
6599 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
6600 | &tmp_sal)) | |
95918acb | 6601 | { |
b2175913 | 6602 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 6603 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 6604 | else |
568d6575 | 6605 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
6606 | return; |
6607 | } | |
6608 | } | |
6609 | ||
6610 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
6611 | set, we stop the step so that the user has a chance to switch |
6612 | in assembly mode. */ | |
16c381f0 | 6613 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 6614 | && step_stop_if_no_debug) |
95918acb | 6615 | { |
bdc36728 | 6616 | end_stepping_range (ecs); |
95918acb AC |
6617 | return; |
6618 | } | |
6619 | ||
b2175913 MS |
6620 | if (execution_direction == EXEC_REVERSE) |
6621 | { | |
acf9414f JK |
6622 | /* If we're already at the start of the function, we've either just |
6623 | stepped backward into a single instruction function without line | |
6624 | number info, or stepped back out of a signal handler to the first | |
6625 | instruction of the function without line number info. Just keep | |
6626 | going, which will single-step back to the caller. */ | |
6627 | if (ecs->stop_func_start != stop_pc) | |
6628 | { | |
6629 | /* Set a breakpoint at callee's start address. | |
6630 | From there we can step once and be back in the caller. */ | |
6631 | struct symtab_and_line sr_sal; | |
abbb1732 | 6632 | |
acf9414f JK |
6633 | init_sal (&sr_sal); |
6634 | sr_sal.pc = ecs->stop_func_start; | |
6635 | sr_sal.pspace = get_frame_program_space (frame); | |
6636 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6637 | sr_sal, null_frame_id); | |
6638 | } | |
b2175913 MS |
6639 | } |
6640 | else | |
6641 | /* Set a breakpoint at callee's return address (the address | |
6642 | at which the caller will resume). */ | |
568d6575 | 6643 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6644 | |
95918acb | 6645 | keep_going (ecs); |
488f131b | 6646 | return; |
488f131b | 6647 | } |
c906108c | 6648 | |
fdd654f3 MS |
6649 | /* Reverse stepping through solib trampolines. */ |
6650 | ||
6651 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6652 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 MS |
6653 | { |
6654 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) | |
6655 | || (ecs->stop_func_start == 0 | |
6656 | && in_solib_dynsym_resolve_code (stop_pc))) | |
6657 | { | |
6658 | /* Any solib trampoline code can be handled in reverse | |
6659 | by simply continuing to single-step. We have already | |
6660 | executed the solib function (backwards), and a few | |
6661 | steps will take us back through the trampoline to the | |
6662 | caller. */ | |
6663 | keep_going (ecs); | |
6664 | return; | |
6665 | } | |
6666 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
6667 | { | |
6668 | /* Stepped backward into the solib dynsym resolver. | |
6669 | Set a breakpoint at its start and continue, then | |
6670 | one more step will take us out. */ | |
6671 | struct symtab_and_line sr_sal; | |
abbb1732 | 6672 | |
fdd654f3 MS |
6673 | init_sal (&sr_sal); |
6674 | sr_sal.pc = ecs->stop_func_start; | |
9d1807c3 | 6675 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
6676 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6677 | sr_sal, null_frame_id); | |
6678 | keep_going (ecs); | |
6679 | return; | |
6680 | } | |
6681 | } | |
6682 | ||
2afb61aa | 6683 | stop_pc_sal = find_pc_line (stop_pc, 0); |
7ed0fe66 | 6684 | |
1b2bfbb9 RC |
6685 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
6686 | the trampoline processing logic, however, there are some trampolines | |
6687 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 6688 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 6689 | && ecs->stop_func_name == NULL |
2afb61aa | 6690 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 6691 | { |
527159b7 | 6692 | if (debug_infrun) |
3e43a32a MS |
6693 | fprintf_unfiltered (gdb_stdlog, |
6694 | "infrun: stepped into undebuggable function\n"); | |
527159b7 | 6695 | |
1b2bfbb9 | 6696 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
6697 | undebuggable function (where there is no debugging information |
6698 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
6699 | inferior stopped). Since we want to skip this kind of code, |
6700 | we keep going until the inferior returns from this | |
14e60db5 DJ |
6701 | function - unless the user has asked us not to (via |
6702 | set step-mode) or we no longer know how to get back | |
6703 | to the call site. */ | |
6704 | if (step_stop_if_no_debug | |
c7ce8faa | 6705 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
6706 | { |
6707 | /* If we have no line number and the step-stop-if-no-debug | |
6708 | is set, we stop the step so that the user has a chance to | |
6709 | switch in assembly mode. */ | |
bdc36728 | 6710 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6711 | return; |
6712 | } | |
6713 | else | |
6714 | { | |
6715 | /* Set a breakpoint at callee's return address (the address | |
6716 | at which the caller will resume). */ | |
568d6575 | 6717 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
6718 | keep_going (ecs); |
6719 | return; | |
6720 | } | |
6721 | } | |
6722 | ||
16c381f0 | 6723 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
6724 | { |
6725 | /* It is stepi or nexti. We always want to stop stepping after | |
6726 | one instruction. */ | |
527159b7 | 6727 | if (debug_infrun) |
8a9de0e4 | 6728 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
bdc36728 | 6729 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6730 | return; |
6731 | } | |
6732 | ||
2afb61aa | 6733 | if (stop_pc_sal.line == 0) |
488f131b JB |
6734 | { |
6735 | /* We have no line number information. That means to stop | |
6736 | stepping (does this always happen right after one instruction, | |
6737 | when we do "s" in a function with no line numbers, | |
6738 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 6739 | if (debug_infrun) |
8a9de0e4 | 6740 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
bdc36728 | 6741 | end_stepping_range (ecs); |
488f131b JB |
6742 | return; |
6743 | } | |
c906108c | 6744 | |
edb3359d DJ |
6745 | /* Look for "calls" to inlined functions, part one. If the inline |
6746 | frame machinery detected some skipped call sites, we have entered | |
6747 | a new inline function. */ | |
6748 | ||
6749 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 6750 | ecs->event_thread->control.step_frame_id) |
edb3359d DJ |
6751 | && inline_skipped_frames (ecs->ptid)) |
6752 | { | |
6753 | struct symtab_and_line call_sal; | |
6754 | ||
6755 | if (debug_infrun) | |
6756 | fprintf_unfiltered (gdb_stdlog, | |
6757 | "infrun: stepped into inlined function\n"); | |
6758 | ||
6759 | find_frame_sal (get_current_frame (), &call_sal); | |
6760 | ||
16c381f0 | 6761 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
6762 | { |
6763 | /* For "step", we're going to stop. But if the call site | |
6764 | for this inlined function is on the same source line as | |
6765 | we were previously stepping, go down into the function | |
6766 | first. Otherwise stop at the call site. */ | |
6767 | ||
6768 | if (call_sal.line == ecs->event_thread->current_line | |
6769 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
6770 | step_into_inline_frame (ecs->ptid); | |
6771 | ||
bdc36728 | 6772 | end_stepping_range (ecs); |
edb3359d DJ |
6773 | return; |
6774 | } | |
6775 | else | |
6776 | { | |
6777 | /* For "next", we should stop at the call site if it is on a | |
6778 | different source line. Otherwise continue through the | |
6779 | inlined function. */ | |
6780 | if (call_sal.line == ecs->event_thread->current_line | |
6781 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
6782 | keep_going (ecs); | |
6783 | else | |
bdc36728 | 6784 | end_stepping_range (ecs); |
edb3359d DJ |
6785 | return; |
6786 | } | |
6787 | } | |
6788 | ||
6789 | /* Look for "calls" to inlined functions, part two. If we are still | |
6790 | in the same real function we were stepping through, but we have | |
6791 | to go further up to find the exact frame ID, we are stepping | |
6792 | through a more inlined call beyond its call site. */ | |
6793 | ||
6794 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
6795 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 6796 | ecs->event_thread->control.step_frame_id) |
edb3359d | 6797 | && stepped_in_from (get_current_frame (), |
16c381f0 | 6798 | ecs->event_thread->control.step_frame_id)) |
edb3359d DJ |
6799 | { |
6800 | if (debug_infrun) | |
6801 | fprintf_unfiltered (gdb_stdlog, | |
6802 | "infrun: stepping through inlined function\n"); | |
6803 | ||
16c381f0 | 6804 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
edb3359d DJ |
6805 | keep_going (ecs); |
6806 | else | |
bdc36728 | 6807 | end_stepping_range (ecs); |
edb3359d DJ |
6808 | return; |
6809 | } | |
6810 | ||
2afb61aa | 6811 | if ((stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
6812 | && (ecs->event_thread->current_line != stop_pc_sal.line |
6813 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b JB |
6814 | { |
6815 | /* We are at the start of a different line. So stop. Note that | |
6816 | we don't stop if we step into the middle of a different line. | |
6817 | That is said to make things like for (;;) statements work | |
6818 | better. */ | |
527159b7 | 6819 | if (debug_infrun) |
3e43a32a MS |
6820 | fprintf_unfiltered (gdb_stdlog, |
6821 | "infrun: stepped to a different line\n"); | |
bdc36728 | 6822 | end_stepping_range (ecs); |
488f131b JB |
6823 | return; |
6824 | } | |
c906108c | 6825 | |
488f131b | 6826 | /* We aren't done stepping. |
c906108c | 6827 | |
488f131b JB |
6828 | Optimize by setting the stepping range to the line. |
6829 | (We might not be in the original line, but if we entered a | |
6830 | new line in mid-statement, we continue stepping. This makes | |
6831 | things like for(;;) statements work better.) */ | |
c906108c | 6832 | |
16c381f0 JK |
6833 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
6834 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 6835 | ecs->event_thread->control.may_range_step = 1; |
edb3359d | 6836 | set_step_info (frame, stop_pc_sal); |
488f131b | 6837 | |
527159b7 | 6838 | if (debug_infrun) |
8a9de0e4 | 6839 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 6840 | keep_going (ecs); |
104c1213 JM |
6841 | } |
6842 | ||
c447ac0b PA |
6843 | /* In all-stop mode, if we're currently stepping but have stopped in |
6844 | some other thread, we may need to switch back to the stepped | |
6845 | thread. Returns true we set the inferior running, false if we left | |
6846 | it stopped (and the event needs further processing). */ | |
6847 | ||
6848 | static int | |
6849 | switch_back_to_stepped_thread (struct execution_control_state *ecs) | |
6850 | { | |
fbea99ea | 6851 | if (!target_is_non_stop_p ()) |
c447ac0b PA |
6852 | { |
6853 | struct thread_info *tp; | |
99619bea PA |
6854 | struct thread_info *stepping_thread; |
6855 | ||
6856 | /* If any thread is blocked on some internal breakpoint, and we | |
6857 | simply need to step over that breakpoint to get it going | |
6858 | again, do that first. */ | |
6859 | ||
6860 | /* However, if we see an event for the stepping thread, then we | |
6861 | know all other threads have been moved past their breakpoints | |
6862 | already. Let the caller check whether the step is finished, | |
6863 | etc., before deciding to move it past a breakpoint. */ | |
6864 | if (ecs->event_thread->control.step_range_end != 0) | |
6865 | return 0; | |
6866 | ||
6867 | /* Check if the current thread is blocked on an incomplete | |
6868 | step-over, interrupted by a random signal. */ | |
6869 | if (ecs->event_thread->control.trap_expected | |
6870 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) | |
c447ac0b | 6871 | { |
99619bea PA |
6872 | if (debug_infrun) |
6873 | { | |
6874 | fprintf_unfiltered (gdb_stdlog, | |
6875 | "infrun: need to finish step-over of [%s]\n", | |
6876 | target_pid_to_str (ecs->event_thread->ptid)); | |
6877 | } | |
6878 | keep_going (ecs); | |
6879 | return 1; | |
6880 | } | |
2adfaa28 | 6881 | |
99619bea PA |
6882 | /* Check if the current thread is blocked by a single-step |
6883 | breakpoint of another thread. */ | |
6884 | if (ecs->hit_singlestep_breakpoint) | |
6885 | { | |
6886 | if (debug_infrun) | |
6887 | { | |
6888 | fprintf_unfiltered (gdb_stdlog, | |
6889 | "infrun: need to step [%s] over single-step " | |
6890 | "breakpoint\n", | |
6891 | target_pid_to_str (ecs->ptid)); | |
6892 | } | |
6893 | keep_going (ecs); | |
6894 | return 1; | |
6895 | } | |
6896 | ||
4d9d9d04 PA |
6897 | /* If this thread needs yet another step-over (e.g., stepping |
6898 | through a delay slot), do it first before moving on to | |
6899 | another thread. */ | |
6900 | if (thread_still_needs_step_over (ecs->event_thread)) | |
6901 | { | |
6902 | if (debug_infrun) | |
6903 | { | |
6904 | fprintf_unfiltered (gdb_stdlog, | |
6905 | "infrun: thread [%s] still needs step-over\n", | |
6906 | target_pid_to_str (ecs->event_thread->ptid)); | |
6907 | } | |
6908 | keep_going (ecs); | |
6909 | return 1; | |
6910 | } | |
70509625 | 6911 | |
483805cf PA |
6912 | /* If scheduler locking applies even if not stepping, there's no |
6913 | need to walk over threads. Above we've checked whether the | |
6914 | current thread is stepping. If some other thread not the | |
6915 | event thread is stepping, then it must be that scheduler | |
6916 | locking is not in effect. */ | |
856e7dd6 | 6917 | if (schedlock_applies (ecs->event_thread)) |
483805cf PA |
6918 | return 0; |
6919 | ||
4d9d9d04 PA |
6920 | /* Otherwise, we no longer expect a trap in the current thread. |
6921 | Clear the trap_expected flag before switching back -- this is | |
6922 | what keep_going does as well, if we call it. */ | |
6923 | ecs->event_thread->control.trap_expected = 0; | |
6924 | ||
6925 | /* Likewise, clear the signal if it should not be passed. */ | |
6926 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
6927 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
6928 | ||
6929 | /* Do all pending step-overs before actually proceeding with | |
483805cf | 6930 | step/next/etc. */ |
4d9d9d04 PA |
6931 | if (start_step_over ()) |
6932 | { | |
6933 | prepare_to_wait (ecs); | |
6934 | return 1; | |
6935 | } | |
6936 | ||
6937 | /* Look for the stepping/nexting thread. */ | |
483805cf | 6938 | stepping_thread = NULL; |
4d9d9d04 | 6939 | |
034f788c | 6940 | ALL_NON_EXITED_THREADS (tp) |
483805cf | 6941 | { |
fbea99ea PA |
6942 | /* Ignore threads of processes the caller is not |
6943 | resuming. */ | |
483805cf | 6944 | if (!sched_multi |
1afd5965 | 6945 | && ptid_get_pid (tp->ptid) != ptid_get_pid (ecs->ptid)) |
483805cf PA |
6946 | continue; |
6947 | ||
6948 | /* When stepping over a breakpoint, we lock all threads | |
6949 | except the one that needs to move past the breakpoint. | |
6950 | If a non-event thread has this set, the "incomplete | |
6951 | step-over" check above should have caught it earlier. */ | |
372316f1 PA |
6952 | if (tp->control.trap_expected) |
6953 | { | |
6954 | internal_error (__FILE__, __LINE__, | |
6955 | "[%s] has inconsistent state: " | |
6956 | "trap_expected=%d\n", | |
6957 | target_pid_to_str (tp->ptid), | |
6958 | tp->control.trap_expected); | |
6959 | } | |
483805cf PA |
6960 | |
6961 | /* Did we find the stepping thread? */ | |
6962 | if (tp->control.step_range_end) | |
6963 | { | |
6964 | /* Yep. There should only one though. */ | |
6965 | gdb_assert (stepping_thread == NULL); | |
6966 | ||
6967 | /* The event thread is handled at the top, before we | |
6968 | enter this loop. */ | |
6969 | gdb_assert (tp != ecs->event_thread); | |
6970 | ||
6971 | /* If some thread other than the event thread is | |
6972 | stepping, then scheduler locking can't be in effect, | |
6973 | otherwise we wouldn't have resumed the current event | |
6974 | thread in the first place. */ | |
856e7dd6 | 6975 | gdb_assert (!schedlock_applies (tp)); |
483805cf PA |
6976 | |
6977 | stepping_thread = tp; | |
6978 | } | |
99619bea PA |
6979 | } |
6980 | ||
483805cf | 6981 | if (stepping_thread != NULL) |
99619bea | 6982 | { |
c447ac0b PA |
6983 | if (debug_infrun) |
6984 | fprintf_unfiltered (gdb_stdlog, | |
6985 | "infrun: switching back to stepped thread\n"); | |
6986 | ||
2ac7589c PA |
6987 | if (keep_going_stepped_thread (stepping_thread)) |
6988 | { | |
6989 | prepare_to_wait (ecs); | |
6990 | return 1; | |
6991 | } | |
6992 | } | |
6993 | } | |
2adfaa28 | 6994 | |
2ac7589c PA |
6995 | return 0; |
6996 | } | |
2adfaa28 | 6997 | |
2ac7589c PA |
6998 | /* Set a previously stepped thread back to stepping. Returns true on |
6999 | success, false if the resume is not possible (e.g., the thread | |
7000 | vanished). */ | |
7001 | ||
7002 | static int | |
7003 | keep_going_stepped_thread (struct thread_info *tp) | |
7004 | { | |
7005 | struct frame_info *frame; | |
7006 | struct gdbarch *gdbarch; | |
7007 | struct execution_control_state ecss; | |
7008 | struct execution_control_state *ecs = &ecss; | |
2adfaa28 | 7009 | |
2ac7589c PA |
7010 | /* If the stepping thread exited, then don't try to switch back and |
7011 | resume it, which could fail in several different ways depending | |
7012 | on the target. Instead, just keep going. | |
2adfaa28 | 7013 | |
2ac7589c PA |
7014 | We can find a stepping dead thread in the thread list in two |
7015 | cases: | |
2adfaa28 | 7016 | |
2ac7589c PA |
7017 | - The target supports thread exit events, and when the target |
7018 | tries to delete the thread from the thread list, inferior_ptid | |
7019 | pointed at the exiting thread. In such case, calling | |
7020 | delete_thread does not really remove the thread from the list; | |
7021 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 7022 | |
2ac7589c PA |
7023 | - The target's debug interface does not support thread exit |
7024 | events, and so we have no idea whatsoever if the previously | |
7025 | stepping thread is still alive. For that reason, we need to | |
7026 | synchronously query the target now. */ | |
2adfaa28 | 7027 | |
2ac7589c PA |
7028 | if (is_exited (tp->ptid) |
7029 | || !target_thread_alive (tp->ptid)) | |
7030 | { | |
7031 | if (debug_infrun) | |
7032 | fprintf_unfiltered (gdb_stdlog, | |
7033 | "infrun: not resuming previously " | |
7034 | "stepped thread, it has vanished\n"); | |
7035 | ||
7036 | delete_thread (tp->ptid); | |
7037 | return 0; | |
c447ac0b | 7038 | } |
2ac7589c PA |
7039 | |
7040 | if (debug_infrun) | |
7041 | fprintf_unfiltered (gdb_stdlog, | |
7042 | "infrun: resuming previously stepped thread\n"); | |
7043 | ||
7044 | reset_ecs (ecs, tp); | |
7045 | switch_to_thread (tp->ptid); | |
7046 | ||
7047 | stop_pc = regcache_read_pc (get_thread_regcache (tp->ptid)); | |
7048 | frame = get_current_frame (); | |
7049 | gdbarch = get_frame_arch (frame); | |
7050 | ||
7051 | /* If the PC of the thread we were trying to single-step has | |
7052 | changed, then that thread has trapped or been signaled, but the | |
7053 | event has not been reported to GDB yet. Re-poll the target | |
7054 | looking for this particular thread's event (i.e. temporarily | |
7055 | enable schedlock) by: | |
7056 | ||
7057 | - setting a break at the current PC | |
7058 | - resuming that particular thread, only (by setting trap | |
7059 | expected) | |
7060 | ||
7061 | This prevents us continuously moving the single-step breakpoint | |
7062 | forward, one instruction at a time, overstepping. */ | |
7063 | ||
7064 | if (stop_pc != tp->prev_pc) | |
7065 | { | |
7066 | ptid_t resume_ptid; | |
7067 | ||
7068 | if (debug_infrun) | |
7069 | fprintf_unfiltered (gdb_stdlog, | |
7070 | "infrun: expected thread advanced also (%s -> %s)\n", | |
7071 | paddress (target_gdbarch (), tp->prev_pc), | |
7072 | paddress (target_gdbarch (), stop_pc)); | |
7073 | ||
7074 | /* Clear the info of the previous step-over, as it's no longer | |
7075 | valid (if the thread was trying to step over a breakpoint, it | |
7076 | has already succeeded). It's what keep_going would do too, | |
7077 | if we called it. Do this before trying to insert the sss | |
7078 | breakpoint, otherwise if we were previously trying to step | |
7079 | over this exact address in another thread, the breakpoint is | |
7080 | skipped. */ | |
7081 | clear_step_over_info (); | |
7082 | tp->control.trap_expected = 0; | |
7083 | ||
7084 | insert_single_step_breakpoint (get_frame_arch (frame), | |
7085 | get_frame_address_space (frame), | |
7086 | stop_pc); | |
7087 | ||
372316f1 | 7088 | tp->resumed = 1; |
fbea99ea | 7089 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
2ac7589c PA |
7090 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
7091 | } | |
7092 | else | |
7093 | { | |
7094 | if (debug_infrun) | |
7095 | fprintf_unfiltered (gdb_stdlog, | |
7096 | "infrun: expected thread still hasn't advanced\n"); | |
7097 | ||
7098 | keep_going_pass_signal (ecs); | |
7099 | } | |
7100 | return 1; | |
c447ac0b PA |
7101 | } |
7102 | ||
8b061563 PA |
7103 | /* Is thread TP in the middle of (software or hardware) |
7104 | single-stepping? (Note the result of this function must never be | |
7105 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 7106 | |
a289b8f6 | 7107 | static int |
b3444185 | 7108 | currently_stepping (struct thread_info *tp) |
a7212384 | 7109 | { |
8358c15c JK |
7110 | return ((tp->control.step_range_end |
7111 | && tp->control.step_resume_breakpoint == NULL) | |
7112 | || tp->control.trap_expected | |
af48d08f | 7113 | || tp->stepped_breakpoint |
8358c15c | 7114 | || bpstat_should_step ()); |
a7212384 UW |
7115 | } |
7116 | ||
b2175913 MS |
7117 | /* Inferior has stepped into a subroutine call with source code that |
7118 | we should not step over. Do step to the first line of code in | |
7119 | it. */ | |
c2c6d25f JM |
7120 | |
7121 | static void | |
568d6575 UW |
7122 | handle_step_into_function (struct gdbarch *gdbarch, |
7123 | struct execution_control_state *ecs) | |
c2c6d25f | 7124 | { |
43f3e411 | 7125 | struct compunit_symtab *cust; |
2afb61aa | 7126 | struct symtab_and_line stop_func_sal, sr_sal; |
c2c6d25f | 7127 | |
7e324e48 GB |
7128 | fill_in_stop_func (gdbarch, ecs); |
7129 | ||
43f3e411 DE |
7130 | cust = find_pc_compunit_symtab (stop_pc); |
7131 | if (cust != NULL && compunit_language (cust) != language_asm) | |
568d6575 | 7132 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, |
b2175913 | 7133 | ecs->stop_func_start); |
c2c6d25f | 7134 | |
2afb61aa | 7135 | stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
7136 | /* Use the step_resume_break to step until the end of the prologue, |
7137 | even if that involves jumps (as it seems to on the vax under | |
7138 | 4.2). */ | |
7139 | /* If the prologue ends in the middle of a source line, continue to | |
7140 | the end of that source line (if it is still within the function). | |
7141 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
7142 | if (stop_func_sal.end |
7143 | && stop_func_sal.pc != ecs->stop_func_start | |
7144 | && stop_func_sal.end < ecs->stop_func_end) | |
7145 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 7146 | |
2dbd5e30 KB |
7147 | /* Architectures which require breakpoint adjustment might not be able |
7148 | to place a breakpoint at the computed address. If so, the test | |
7149 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
7150 | ecs->stop_func_start to an address at which a breakpoint may be | |
7151 | legitimately placed. | |
8fb3e588 | 7152 | |
2dbd5e30 KB |
7153 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
7154 | made, GDB will enter an infinite loop when stepping through | |
7155 | optimized code consisting of VLIW instructions which contain | |
7156 | subinstructions corresponding to different source lines. On | |
7157 | FR-V, it's not permitted to place a breakpoint on any but the | |
7158 | first subinstruction of a VLIW instruction. When a breakpoint is | |
7159 | set, GDB will adjust the breakpoint address to the beginning of | |
7160 | the VLIW instruction. Thus, we need to make the corresponding | |
7161 | adjustment here when computing the stop address. */ | |
8fb3e588 | 7162 | |
568d6575 | 7163 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
7164 | { |
7165 | ecs->stop_func_start | |
568d6575 | 7166 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 7167 | ecs->stop_func_start); |
2dbd5e30 KB |
7168 | } |
7169 | ||
c2c6d25f JM |
7170 | if (ecs->stop_func_start == stop_pc) |
7171 | { | |
7172 | /* We are already there: stop now. */ | |
bdc36728 | 7173 | end_stepping_range (ecs); |
c2c6d25f JM |
7174 | return; |
7175 | } | |
7176 | else | |
7177 | { | |
7178 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 7179 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
7180 | sr_sal.pc = ecs->stop_func_start; |
7181 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 7182 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 7183 | |
c2c6d25f | 7184 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
7185 | some machines the prologue is where the new fp value is |
7186 | established. */ | |
a6d9a66e | 7187 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
7188 | |
7189 | /* And make sure stepping stops right away then. */ | |
16c381f0 JK |
7190 | ecs->event_thread->control.step_range_end |
7191 | = ecs->event_thread->control.step_range_start; | |
c2c6d25f JM |
7192 | } |
7193 | keep_going (ecs); | |
7194 | } | |
d4f3574e | 7195 | |
b2175913 MS |
7196 | /* Inferior has stepped backward into a subroutine call with source |
7197 | code that we should not step over. Do step to the beginning of the | |
7198 | last line of code in it. */ | |
7199 | ||
7200 | static void | |
568d6575 UW |
7201 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
7202 | struct execution_control_state *ecs) | |
b2175913 | 7203 | { |
43f3e411 | 7204 | struct compunit_symtab *cust; |
167e4384 | 7205 | struct symtab_and_line stop_func_sal; |
b2175913 | 7206 | |
7e324e48 GB |
7207 | fill_in_stop_func (gdbarch, ecs); |
7208 | ||
43f3e411 DE |
7209 | cust = find_pc_compunit_symtab (stop_pc); |
7210 | if (cust != NULL && compunit_language (cust) != language_asm) | |
568d6575 | 7211 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, |
b2175913 MS |
7212 | ecs->stop_func_start); |
7213 | ||
7214 | stop_func_sal = find_pc_line (stop_pc, 0); | |
7215 | ||
7216 | /* OK, we're just going to keep stepping here. */ | |
7217 | if (stop_func_sal.pc == stop_pc) | |
7218 | { | |
7219 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 7220 | end_stepping_range (ecs); |
b2175913 MS |
7221 | } |
7222 | else | |
7223 | { | |
7224 | /* Else just reset the step range and keep going. | |
7225 | No step-resume breakpoint, they don't work for | |
7226 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
7227 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
7228 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
7229 | keep_going (ecs); |
7230 | } | |
7231 | return; | |
7232 | } | |
7233 | ||
d3169d93 | 7234 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
7235 | This is used to both functions and to skip over code. */ |
7236 | ||
7237 | static void | |
2c03e5be PA |
7238 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
7239 | struct symtab_and_line sr_sal, | |
7240 | struct frame_id sr_id, | |
7241 | enum bptype sr_type) | |
44cbf7b5 | 7242 | { |
611c83ae PA |
7243 | /* There should never be more than one step-resume or longjmp-resume |
7244 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 7245 | step_resume_breakpoint when one is already active. */ |
8358c15c | 7246 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 7247 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 DJ |
7248 | |
7249 | if (debug_infrun) | |
7250 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7251 | "infrun: inserting step-resume breakpoint at %s\n", |
7252 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 7253 | |
8358c15c | 7254 | inferior_thread ()->control.step_resume_breakpoint |
2c03e5be PA |
7255 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type); |
7256 | } | |
7257 | ||
9da8c2a0 | 7258 | void |
2c03e5be PA |
7259 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
7260 | struct symtab_and_line sr_sal, | |
7261 | struct frame_id sr_id) | |
7262 | { | |
7263 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
7264 | sr_sal, sr_id, | |
7265 | bp_step_resume); | |
44cbf7b5 | 7266 | } |
7ce450bd | 7267 | |
2c03e5be PA |
7268 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
7269 | This is used to skip a potential signal handler. | |
7ce450bd | 7270 | |
14e60db5 DJ |
7271 | This is called with the interrupted function's frame. The signal |
7272 | handler, when it returns, will resume the interrupted function at | |
7273 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
7274 | |
7275 | static void | |
2c03e5be | 7276 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 AC |
7277 | { |
7278 | struct symtab_and_line sr_sal; | |
a6d9a66e | 7279 | struct gdbarch *gdbarch; |
d303a6c7 | 7280 | |
f4c1edd8 | 7281 | gdb_assert (return_frame != NULL); |
d303a6c7 AC |
7282 | init_sal (&sr_sal); /* initialize to zeros */ |
7283 | ||
a6d9a66e | 7284 | gdbarch = get_frame_arch (return_frame); |
568d6575 | 7285 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 7286 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7287 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 7288 | |
2c03e5be PA |
7289 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
7290 | get_stack_frame_id (return_frame), | |
7291 | bp_hp_step_resume); | |
d303a6c7 AC |
7292 | } |
7293 | ||
2c03e5be PA |
7294 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
7295 | is used to skip a function after stepping into it (for "next" or if | |
7296 | the called function has no debugging information). | |
14e60db5 DJ |
7297 | |
7298 | The current function has almost always been reached by single | |
7299 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
7300 | current function, and the breakpoint will be set at the caller's | |
7301 | resume address. | |
7302 | ||
7303 | This is a separate function rather than reusing | |
2c03e5be | 7304 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 7305 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 7306 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
7307 | |
7308 | static void | |
7309 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
7310 | { | |
7311 | struct symtab_and_line sr_sal; | |
a6d9a66e | 7312 | struct gdbarch *gdbarch; |
14e60db5 DJ |
7313 | |
7314 | /* We shouldn't have gotten here if we don't know where the call site | |
7315 | is. */ | |
c7ce8faa | 7316 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 DJ |
7317 | |
7318 | init_sal (&sr_sal); /* initialize to zeros */ | |
7319 | ||
a6d9a66e | 7320 | gdbarch = frame_unwind_caller_arch (next_frame); |
c7ce8faa DJ |
7321 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
7322 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 7323 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7324 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 7325 | |
a6d9a66e | 7326 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 7327 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
7328 | } |
7329 | ||
611c83ae PA |
7330 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
7331 | new breakpoint at the target of a jmp_buf. The handling of | |
7332 | longjmp-resume uses the same mechanisms used for handling | |
7333 | "step-resume" breakpoints. */ | |
7334 | ||
7335 | static void | |
a6d9a66e | 7336 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 7337 | { |
e81a37f7 TT |
7338 | /* There should never be more than one longjmp-resume breakpoint per |
7339 | thread, so we should never be setting a new | |
611c83ae | 7340 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 7341 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae PA |
7342 | |
7343 | if (debug_infrun) | |
7344 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7345 | "infrun: inserting longjmp-resume breakpoint at %s\n", |
7346 | paddress (gdbarch, pc)); | |
611c83ae | 7347 | |
e81a37f7 | 7348 | inferior_thread ()->control.exception_resume_breakpoint = |
a6d9a66e | 7349 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume); |
611c83ae PA |
7350 | } |
7351 | ||
186c406b TT |
7352 | /* Insert an exception resume breakpoint. TP is the thread throwing |
7353 | the exception. The block B is the block of the unwinder debug hook | |
7354 | function. FRAME is the frame corresponding to the call to this | |
7355 | function. SYM is the symbol of the function argument holding the | |
7356 | target PC of the exception. */ | |
7357 | ||
7358 | static void | |
7359 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 7360 | const struct block *b, |
186c406b TT |
7361 | struct frame_info *frame, |
7362 | struct symbol *sym) | |
7363 | { | |
492d29ea | 7364 | TRY |
186c406b | 7365 | { |
63e43d3a | 7366 | struct block_symbol vsym; |
186c406b TT |
7367 | struct value *value; |
7368 | CORE_ADDR handler; | |
7369 | struct breakpoint *bp; | |
7370 | ||
63e43d3a PMR |
7371 | vsym = lookup_symbol (SYMBOL_LINKAGE_NAME (sym), b, VAR_DOMAIN, NULL); |
7372 | value = read_var_value (vsym.symbol, vsym.block, frame); | |
186c406b TT |
7373 | /* If the value was optimized out, revert to the old behavior. */ |
7374 | if (! value_optimized_out (value)) | |
7375 | { | |
7376 | handler = value_as_address (value); | |
7377 | ||
7378 | if (debug_infrun) | |
7379 | fprintf_unfiltered (gdb_stdlog, | |
7380 | "infrun: exception resume at %lx\n", | |
7381 | (unsigned long) handler); | |
7382 | ||
7383 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
7384 | handler, bp_exception_resume); | |
c70a6932 JK |
7385 | |
7386 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
7387 | frame = NULL; | |
7388 | ||
186c406b TT |
7389 | bp->thread = tp->num; |
7390 | inferior_thread ()->control.exception_resume_breakpoint = bp; | |
7391 | } | |
7392 | } | |
492d29ea PA |
7393 | CATCH (e, RETURN_MASK_ERROR) |
7394 | { | |
7395 | /* We want to ignore errors here. */ | |
7396 | } | |
7397 | END_CATCH | |
186c406b TT |
7398 | } |
7399 | ||
28106bc2 SDJ |
7400 | /* A helper for check_exception_resume that sets an |
7401 | exception-breakpoint based on a SystemTap probe. */ | |
7402 | ||
7403 | static void | |
7404 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 7405 | const struct bound_probe *probe, |
28106bc2 SDJ |
7406 | struct frame_info *frame) |
7407 | { | |
7408 | struct value *arg_value; | |
7409 | CORE_ADDR handler; | |
7410 | struct breakpoint *bp; | |
7411 | ||
7412 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
7413 | if (!arg_value) | |
7414 | return; | |
7415 | ||
7416 | handler = value_as_address (arg_value); | |
7417 | ||
7418 | if (debug_infrun) | |
7419 | fprintf_unfiltered (gdb_stdlog, | |
7420 | "infrun: exception resume at %s\n", | |
6bac7473 | 7421 | paddress (get_objfile_arch (probe->objfile), |
28106bc2 SDJ |
7422 | handler)); |
7423 | ||
7424 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
7425 | handler, bp_exception_resume); | |
7426 | bp->thread = tp->num; | |
7427 | inferior_thread ()->control.exception_resume_breakpoint = bp; | |
7428 | } | |
7429 | ||
186c406b TT |
7430 | /* This is called when an exception has been intercepted. Check to |
7431 | see whether the exception's destination is of interest, and if so, | |
7432 | set an exception resume breakpoint there. */ | |
7433 | ||
7434 | static void | |
7435 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 7436 | struct frame_info *frame) |
186c406b | 7437 | { |
729662a5 | 7438 | struct bound_probe probe; |
28106bc2 SDJ |
7439 | struct symbol *func; |
7440 | ||
7441 | /* First see if this exception unwinding breakpoint was set via a | |
7442 | SystemTap probe point. If so, the probe has two arguments: the | |
7443 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
7444 | set a breakpoint there. */ | |
6bac7473 | 7445 | probe = find_probe_by_pc (get_frame_pc (frame)); |
729662a5 | 7446 | if (probe.probe) |
28106bc2 | 7447 | { |
729662a5 | 7448 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
7449 | return; |
7450 | } | |
7451 | ||
7452 | func = get_frame_function (frame); | |
7453 | if (!func) | |
7454 | return; | |
186c406b | 7455 | |
492d29ea | 7456 | TRY |
186c406b | 7457 | { |
3977b71f | 7458 | const struct block *b; |
8157b174 | 7459 | struct block_iterator iter; |
186c406b TT |
7460 | struct symbol *sym; |
7461 | int argno = 0; | |
7462 | ||
7463 | /* The exception breakpoint is a thread-specific breakpoint on | |
7464 | the unwinder's debug hook, declared as: | |
7465 | ||
7466 | void _Unwind_DebugHook (void *cfa, void *handler); | |
7467 | ||
7468 | The CFA argument indicates the frame to which control is | |
7469 | about to be transferred. HANDLER is the destination PC. | |
7470 | ||
7471 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
7472 | This is not extremely efficient but it avoids issues in gdb | |
7473 | with computing the DWARF CFA, and it also works even in weird | |
7474 | cases such as throwing an exception from inside a signal | |
7475 | handler. */ | |
7476 | ||
7477 | b = SYMBOL_BLOCK_VALUE (func); | |
7478 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
7479 | { | |
7480 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
7481 | continue; | |
7482 | ||
7483 | if (argno == 0) | |
7484 | ++argno; | |
7485 | else | |
7486 | { | |
7487 | insert_exception_resume_breakpoint (ecs->event_thread, | |
7488 | b, frame, sym); | |
7489 | break; | |
7490 | } | |
7491 | } | |
7492 | } | |
492d29ea PA |
7493 | CATCH (e, RETURN_MASK_ERROR) |
7494 | { | |
7495 | } | |
7496 | END_CATCH | |
186c406b TT |
7497 | } |
7498 | ||
104c1213 | 7499 | static void |
22bcd14b | 7500 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 7501 | { |
527159b7 | 7502 | if (debug_infrun) |
22bcd14b | 7503 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_waiting\n"); |
527159b7 | 7504 | |
31e77af2 PA |
7505 | clear_step_over_info (); |
7506 | ||
cd0fc7c3 SS |
7507 | /* Let callers know we don't want to wait for the inferior anymore. */ |
7508 | ecs->wait_some_more = 0; | |
fbea99ea PA |
7509 | |
7510 | /* If all-stop, but the target is always in non-stop mode, stop all | |
7511 | threads now that we're presenting the stop to the user. */ | |
7512 | if (!non_stop && target_is_non_stop_p ()) | |
7513 | stop_all_threads (); | |
cd0fc7c3 SS |
7514 | } |
7515 | ||
4d9d9d04 PA |
7516 | /* Like keep_going, but passes the signal to the inferior, even if the |
7517 | signal is set to nopass. */ | |
d4f3574e SS |
7518 | |
7519 | static void | |
4d9d9d04 | 7520 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 7521 | { |
c4dbc9af PA |
7522 | /* Make sure normal_stop is called if we get a QUIT handled before |
7523 | reaching resume. */ | |
7524 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); | |
7525 | ||
4d9d9d04 | 7526 | gdb_assert (ptid_equal (ecs->event_thread->ptid, inferior_ptid)); |
372316f1 | 7527 | gdb_assert (!ecs->event_thread->resumed); |
4d9d9d04 | 7528 | |
d4f3574e | 7529 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b UW |
7530 | ecs->event_thread->prev_pc |
7531 | = regcache_read_pc (get_thread_regcache (ecs->ptid)); | |
d4f3574e | 7532 | |
4d9d9d04 | 7533 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 7534 | { |
4d9d9d04 PA |
7535 | struct thread_info *tp = ecs->event_thread; |
7536 | ||
7537 | if (debug_infrun) | |
7538 | fprintf_unfiltered (gdb_stdlog, | |
7539 | "infrun: %s has trap_expected set, " | |
7540 | "resuming to collect trap\n", | |
7541 | target_pid_to_str (tp->ptid)); | |
7542 | ||
a9ba6bae PA |
7543 | /* We haven't yet gotten our trap, and either: intercepted a |
7544 | non-signal event (e.g., a fork); or took a signal which we | |
7545 | are supposed to pass through to the inferior. Simply | |
7546 | continue. */ | |
c4dbc9af | 7547 | discard_cleanups (old_cleanups); |
64ce06e4 | 7548 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e | 7549 | } |
372316f1 PA |
7550 | else if (step_over_info_valid_p ()) |
7551 | { | |
7552 | /* Another thread is stepping over a breakpoint in-line. If | |
7553 | this thread needs a step-over too, queue the request. In | |
7554 | either case, this resume must be deferred for later. */ | |
7555 | struct thread_info *tp = ecs->event_thread; | |
7556 | ||
7557 | if (ecs->hit_singlestep_breakpoint | |
7558 | || thread_still_needs_step_over (tp)) | |
7559 | { | |
7560 | if (debug_infrun) | |
7561 | fprintf_unfiltered (gdb_stdlog, | |
7562 | "infrun: step-over already in progress: " | |
7563 | "step-over for %s deferred\n", | |
7564 | target_pid_to_str (tp->ptid)); | |
7565 | thread_step_over_chain_enqueue (tp); | |
7566 | } | |
7567 | else | |
7568 | { | |
7569 | if (debug_infrun) | |
7570 | fprintf_unfiltered (gdb_stdlog, | |
7571 | "infrun: step-over in progress: " | |
7572 | "resume of %s deferred\n", | |
7573 | target_pid_to_str (tp->ptid)); | |
7574 | } | |
7575 | ||
7576 | discard_cleanups (old_cleanups); | |
7577 | } | |
d4f3574e SS |
7578 | else |
7579 | { | |
31e77af2 | 7580 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
7581 | int remove_bp; |
7582 | int remove_wps; | |
8d297bbf | 7583 | step_over_what step_what; |
31e77af2 | 7584 | |
d4f3574e | 7585 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
7586 | anyway (if we got a signal, the user asked it be passed to |
7587 | the child) | |
7588 | -- or -- | |
7589 | We got our expected trap, but decided we should resume from | |
7590 | it. | |
d4f3574e | 7591 | |
a9ba6bae | 7592 | We're going to run this baby now! |
d4f3574e | 7593 | |
c36b740a VP |
7594 | Note that insert_breakpoints won't try to re-insert |
7595 | already inserted breakpoints. Therefore, we don't | |
7596 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 7597 | |
31e77af2 PA |
7598 | /* If we need to step over a breakpoint, and we're not using |
7599 | displaced stepping to do so, insert all breakpoints | |
7600 | (watchpoints, etc.) but the one we're stepping over, step one | |
7601 | instruction, and then re-insert the breakpoint when that step | |
7602 | is finished. */ | |
963f9c80 | 7603 | |
6c4cfb24 PA |
7604 | step_what = thread_still_needs_step_over (ecs->event_thread); |
7605 | ||
963f9c80 | 7606 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
7607 | || (step_what & STEP_OVER_BREAKPOINT)); |
7608 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 7609 | |
cb71640d PA |
7610 | /* We can't use displaced stepping if we need to step past a |
7611 | watchpoint. The instruction copied to the scratch pad would | |
7612 | still trigger the watchpoint. */ | |
7613 | if (remove_bp | |
3fc8eb30 | 7614 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 7615 | { |
31e77af2 | 7616 | set_step_over_info (get_regcache_aspace (regcache), |
963f9c80 | 7617 | regcache_read_pc (regcache), remove_wps); |
45e8c884 | 7618 | } |
963f9c80 PA |
7619 | else if (remove_wps) |
7620 | set_step_over_info (NULL, 0, remove_wps); | |
372316f1 PA |
7621 | |
7622 | /* If we now need to do an in-line step-over, we need to stop | |
7623 | all other threads. Note this must be done before | |
7624 | insert_breakpoints below, because that removes the breakpoint | |
7625 | we're about to step over, otherwise other threads could miss | |
7626 | it. */ | |
fbea99ea | 7627 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
372316f1 | 7628 | stop_all_threads (); |
abbb1732 | 7629 | |
31e77af2 | 7630 | /* Stop stepping if inserting breakpoints fails. */ |
492d29ea | 7631 | TRY |
31e77af2 PA |
7632 | { |
7633 | insert_breakpoints (); | |
7634 | } | |
492d29ea | 7635 | CATCH (e, RETURN_MASK_ERROR) |
31e77af2 PA |
7636 | { |
7637 | exception_print (gdb_stderr, e); | |
22bcd14b | 7638 | stop_waiting (ecs); |
de1fe8c8 | 7639 | discard_cleanups (old_cleanups); |
31e77af2 | 7640 | return; |
d4f3574e | 7641 | } |
492d29ea | 7642 | END_CATCH |
d4f3574e | 7643 | |
963f9c80 | 7644 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 7645 | |
c4dbc9af | 7646 | discard_cleanups (old_cleanups); |
64ce06e4 | 7647 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
7648 | } |
7649 | ||
488f131b | 7650 | prepare_to_wait (ecs); |
d4f3574e SS |
7651 | } |
7652 | ||
4d9d9d04 PA |
7653 | /* Called when we should continue running the inferior, because the |
7654 | current event doesn't cause a user visible stop. This does the | |
7655 | resuming part; waiting for the next event is done elsewhere. */ | |
7656 | ||
7657 | static void | |
7658 | keep_going (struct execution_control_state *ecs) | |
7659 | { | |
7660 | if (ecs->event_thread->control.trap_expected | |
7661 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
7662 | ecs->event_thread->control.trap_expected = 0; | |
7663 | ||
7664 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7665 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7666 | keep_going_pass_signal (ecs); | |
7667 | } | |
7668 | ||
104c1213 JM |
7669 | /* This function normally comes after a resume, before |
7670 | handle_inferior_event exits. It takes care of any last bits of | |
7671 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 7672 | |
104c1213 JM |
7673 | static void |
7674 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 7675 | { |
527159b7 | 7676 | if (debug_infrun) |
8a9de0e4 | 7677 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
104c1213 | 7678 | |
104c1213 | 7679 | ecs->wait_some_more = 1; |
0b333c5e PA |
7680 | |
7681 | if (!target_is_async_p ()) | |
7682 | mark_infrun_async_event_handler (); | |
c906108c | 7683 | } |
11cf8741 | 7684 | |
fd664c91 | 7685 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 7686 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
7687 | |
7688 | static void | |
bdc36728 | 7689 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 7690 | { |
bdc36728 | 7691 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 7692 | stop_waiting (ecs); |
fd664c91 PA |
7693 | } |
7694 | ||
33d62d64 JK |
7695 | /* Several print_*_reason functions to print why the inferior has stopped. |
7696 | We always print something when the inferior exits, or receives a signal. | |
7697 | The rest of the cases are dealt with later on in normal_stop and | |
7698 | print_it_typical. Ideally there should be a call to one of these | |
7699 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 7700 | stop_waiting is called. |
33d62d64 | 7701 | |
fd664c91 PA |
7702 | Note that we don't call these directly, instead we delegate that to |
7703 | the interpreters, through observers. Interpreters then call these | |
7704 | with whatever uiout is right. */ | |
33d62d64 | 7705 | |
fd664c91 PA |
7706 | void |
7707 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 7708 | { |
fd664c91 | 7709 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 7710 | |
fd664c91 PA |
7711 | if (ui_out_is_mi_like_p (uiout)) |
7712 | { | |
7713 | ui_out_field_string (uiout, "reason", | |
7714 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); | |
7715 | } | |
7716 | } | |
33d62d64 | 7717 | |
fd664c91 PA |
7718 | void |
7719 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 7720 | { |
33d62d64 JK |
7721 | annotate_signalled (); |
7722 | if (ui_out_is_mi_like_p (uiout)) | |
7723 | ui_out_field_string | |
7724 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
7725 | ui_out_text (uiout, "\nProgram terminated with signal "); | |
7726 | annotate_signal_name (); | |
7727 | ui_out_field_string (uiout, "signal-name", | |
2ea28649 | 7728 | gdb_signal_to_name (siggnal)); |
33d62d64 JK |
7729 | annotate_signal_name_end (); |
7730 | ui_out_text (uiout, ", "); | |
7731 | annotate_signal_string (); | |
7732 | ui_out_field_string (uiout, "signal-meaning", | |
2ea28649 | 7733 | gdb_signal_to_string (siggnal)); |
33d62d64 JK |
7734 | annotate_signal_string_end (); |
7735 | ui_out_text (uiout, ".\n"); | |
7736 | ui_out_text (uiout, "The program no longer exists.\n"); | |
7737 | } | |
7738 | ||
fd664c91 PA |
7739 | void |
7740 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 7741 | { |
fda326dd TT |
7742 | struct inferior *inf = current_inferior (); |
7743 | const char *pidstr = target_pid_to_str (pid_to_ptid (inf->pid)); | |
7744 | ||
33d62d64 JK |
7745 | annotate_exited (exitstatus); |
7746 | if (exitstatus) | |
7747 | { | |
7748 | if (ui_out_is_mi_like_p (uiout)) | |
7749 | ui_out_field_string (uiout, "reason", | |
7750 | async_reason_lookup (EXEC_ASYNC_EXITED)); | |
fda326dd TT |
7751 | ui_out_text (uiout, "[Inferior "); |
7752 | ui_out_text (uiout, plongest (inf->num)); | |
7753 | ui_out_text (uiout, " ("); | |
7754 | ui_out_text (uiout, pidstr); | |
7755 | ui_out_text (uiout, ") exited with code "); | |
33d62d64 | 7756 | ui_out_field_fmt (uiout, "exit-code", "0%o", (unsigned int) exitstatus); |
fda326dd | 7757 | ui_out_text (uiout, "]\n"); |
33d62d64 JK |
7758 | } |
7759 | else | |
11cf8741 | 7760 | { |
9dc5e2a9 | 7761 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f | 7762 | ui_out_field_string |
33d62d64 | 7763 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); |
fda326dd TT |
7764 | ui_out_text (uiout, "[Inferior "); |
7765 | ui_out_text (uiout, plongest (inf->num)); | |
7766 | ui_out_text (uiout, " ("); | |
7767 | ui_out_text (uiout, pidstr); | |
7768 | ui_out_text (uiout, ") exited normally]\n"); | |
33d62d64 | 7769 | } |
33d62d64 JK |
7770 | } |
7771 | ||
fd664c91 PA |
7772 | void |
7773 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 JK |
7774 | { |
7775 | annotate_signal (); | |
7776 | ||
a493e3e2 | 7777 | if (siggnal == GDB_SIGNAL_0 && !ui_out_is_mi_like_p (uiout)) |
33d62d64 JK |
7778 | { |
7779 | struct thread_info *t = inferior_thread (); | |
7780 | ||
7781 | ui_out_text (uiout, "\n["); | |
7782 | ui_out_field_string (uiout, "thread-name", | |
7783 | target_pid_to_str (t->ptid)); | |
7784 | ui_out_field_fmt (uiout, "thread-id", "] #%d", t->num); | |
7785 | ui_out_text (uiout, " stopped"); | |
7786 | } | |
7787 | else | |
7788 | { | |
7789 | ui_out_text (uiout, "\nProgram received signal "); | |
8b93c638 | 7790 | annotate_signal_name (); |
33d62d64 JK |
7791 | if (ui_out_is_mi_like_p (uiout)) |
7792 | ui_out_field_string | |
7793 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
488f131b | 7794 | ui_out_field_string (uiout, "signal-name", |
2ea28649 | 7795 | gdb_signal_to_name (siggnal)); |
8b93c638 JM |
7796 | annotate_signal_name_end (); |
7797 | ui_out_text (uiout, ", "); | |
7798 | annotate_signal_string (); | |
488f131b | 7799 | ui_out_field_string (uiout, "signal-meaning", |
2ea28649 | 7800 | gdb_signal_to_string (siggnal)); |
8b93c638 | 7801 | annotate_signal_string_end (); |
33d62d64 JK |
7802 | } |
7803 | ui_out_text (uiout, ".\n"); | |
7804 | } | |
252fbfc8 | 7805 | |
fd664c91 PA |
7806 | void |
7807 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 7808 | { |
fd664c91 | 7809 | ui_out_text (uiout, "\nNo more reverse-execution history.\n"); |
11cf8741 | 7810 | } |
43ff13b4 | 7811 | |
0c7e1a46 PA |
7812 | /* Print current location without a level number, if we have changed |
7813 | functions or hit a breakpoint. Print source line if we have one. | |
7814 | bpstat_print contains the logic deciding in detail what to print, | |
7815 | based on the event(s) that just occurred. */ | |
7816 | ||
243a9253 PA |
7817 | static void |
7818 | print_stop_location (struct target_waitstatus *ws) | |
0c7e1a46 PA |
7819 | { |
7820 | int bpstat_ret; | |
f486487f | 7821 | enum print_what source_flag; |
0c7e1a46 PA |
7822 | int do_frame_printing = 1; |
7823 | struct thread_info *tp = inferior_thread (); | |
7824 | ||
7825 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws->kind); | |
7826 | switch (bpstat_ret) | |
7827 | { | |
7828 | case PRINT_UNKNOWN: | |
7829 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
7830 | should) carry around the function and does (or should) use | |
7831 | that when doing a frame comparison. */ | |
7832 | if (tp->control.stop_step | |
7833 | && frame_id_eq (tp->control.step_frame_id, | |
7834 | get_frame_id (get_current_frame ())) | |
885eeb5b | 7835 | && tp->control.step_start_function == find_pc_function (stop_pc)) |
0c7e1a46 PA |
7836 | { |
7837 | /* Finished step, just print source line. */ | |
7838 | source_flag = SRC_LINE; | |
7839 | } | |
7840 | else | |
7841 | { | |
7842 | /* Print location and source line. */ | |
7843 | source_flag = SRC_AND_LOC; | |
7844 | } | |
7845 | break; | |
7846 | case PRINT_SRC_AND_LOC: | |
7847 | /* Print location and source line. */ | |
7848 | source_flag = SRC_AND_LOC; | |
7849 | break; | |
7850 | case PRINT_SRC_ONLY: | |
7851 | source_flag = SRC_LINE; | |
7852 | break; | |
7853 | case PRINT_NOTHING: | |
7854 | /* Something bogus. */ | |
7855 | source_flag = SRC_LINE; | |
7856 | do_frame_printing = 0; | |
7857 | break; | |
7858 | default: | |
7859 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
7860 | } | |
7861 | ||
7862 | /* The behavior of this routine with respect to the source | |
7863 | flag is: | |
7864 | SRC_LINE: Print only source line | |
7865 | LOCATION: Print only location | |
7866 | SRC_AND_LOC: Print location and source line. */ | |
7867 | if (do_frame_printing) | |
7868 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
243a9253 PA |
7869 | } |
7870 | ||
7871 | /* Cleanup that restores a previous current uiout. */ | |
7872 | ||
7873 | static void | |
7874 | restore_current_uiout_cleanup (void *arg) | |
7875 | { | |
9a3c8263 | 7876 | struct ui_out *saved_uiout = (struct ui_out *) arg; |
243a9253 PA |
7877 | |
7878 | current_uiout = saved_uiout; | |
7879 | } | |
7880 | ||
7881 | /* See infrun.h. */ | |
7882 | ||
7883 | void | |
7884 | print_stop_event (struct ui_out *uiout) | |
7885 | { | |
7886 | struct cleanup *old_chain; | |
7887 | struct target_waitstatus last; | |
7888 | ptid_t last_ptid; | |
7889 | struct thread_info *tp; | |
7890 | ||
7891 | get_last_target_status (&last_ptid, &last); | |
7892 | ||
7893 | old_chain = make_cleanup (restore_current_uiout_cleanup, current_uiout); | |
7894 | current_uiout = uiout; | |
7895 | ||
7896 | print_stop_location (&last); | |
0c7e1a46 PA |
7897 | |
7898 | /* Display the auto-display expressions. */ | |
7899 | do_displays (); | |
243a9253 PA |
7900 | |
7901 | do_cleanups (old_chain); | |
7902 | ||
7903 | tp = inferior_thread (); | |
7904 | if (tp->thread_fsm != NULL | |
7905 | && thread_fsm_finished_p (tp->thread_fsm)) | |
7906 | { | |
7907 | struct return_value_info *rv; | |
7908 | ||
7909 | rv = thread_fsm_return_value (tp->thread_fsm); | |
7910 | if (rv != NULL) | |
7911 | print_return_value (uiout, rv); | |
7912 | } | |
0c7e1a46 PA |
7913 | } |
7914 | ||
388a7084 PA |
7915 | /* See infrun.h. */ |
7916 | ||
7917 | void | |
7918 | maybe_remove_breakpoints (void) | |
7919 | { | |
7920 | if (!breakpoints_should_be_inserted_now () && target_has_execution) | |
7921 | { | |
7922 | if (remove_breakpoints ()) | |
7923 | { | |
7924 | target_terminal_ours_for_output (); | |
7925 | printf_filtered (_("Cannot remove breakpoints because " | |
7926 | "program is no longer writable.\nFurther " | |
7927 | "execution is probably impossible.\n")); | |
7928 | } | |
7929 | } | |
7930 | } | |
7931 | ||
4c2f2a79 PA |
7932 | /* The execution context that just caused a normal stop. */ |
7933 | ||
7934 | struct stop_context | |
7935 | { | |
7936 | /* The stop ID. */ | |
7937 | ULONGEST stop_id; | |
c906108c | 7938 | |
4c2f2a79 | 7939 | /* The event PTID. */ |
c906108c | 7940 | |
4c2f2a79 PA |
7941 | ptid_t ptid; |
7942 | ||
7943 | /* If stopp for a thread event, this is the thread that caused the | |
7944 | stop. */ | |
7945 | struct thread_info *thread; | |
7946 | ||
7947 | /* The inferior that caused the stop. */ | |
7948 | int inf_num; | |
7949 | }; | |
7950 | ||
7951 | /* Returns a new stop context. If stopped for a thread event, this | |
7952 | takes a strong reference to the thread. */ | |
7953 | ||
7954 | static struct stop_context * | |
7955 | save_stop_context (void) | |
7956 | { | |
224c3ddb | 7957 | struct stop_context *sc = XNEW (struct stop_context); |
4c2f2a79 PA |
7958 | |
7959 | sc->stop_id = get_stop_id (); | |
7960 | sc->ptid = inferior_ptid; | |
7961 | sc->inf_num = current_inferior ()->num; | |
7962 | ||
7963 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
7964 | { | |
7965 | /* Take a strong reference so that the thread can't be deleted | |
7966 | yet. */ | |
7967 | sc->thread = inferior_thread (); | |
7968 | sc->thread->refcount++; | |
7969 | } | |
7970 | else | |
7971 | sc->thread = NULL; | |
7972 | ||
7973 | return sc; | |
7974 | } | |
7975 | ||
7976 | /* Release a stop context previously created with save_stop_context. | |
7977 | Releases the strong reference to the thread as well. */ | |
7978 | ||
7979 | static void | |
7980 | release_stop_context_cleanup (void *arg) | |
7981 | { | |
9a3c8263 | 7982 | struct stop_context *sc = (struct stop_context *) arg; |
4c2f2a79 PA |
7983 | |
7984 | if (sc->thread != NULL) | |
7985 | sc->thread->refcount--; | |
7986 | xfree (sc); | |
7987 | } | |
7988 | ||
7989 | /* Return true if the current context no longer matches the saved stop | |
7990 | context. */ | |
7991 | ||
7992 | static int | |
7993 | stop_context_changed (struct stop_context *prev) | |
7994 | { | |
7995 | if (!ptid_equal (prev->ptid, inferior_ptid)) | |
7996 | return 1; | |
7997 | if (prev->inf_num != current_inferior ()->num) | |
7998 | return 1; | |
7999 | if (prev->thread != NULL && prev->thread->state != THREAD_STOPPED) | |
8000 | return 1; | |
8001 | if (get_stop_id () != prev->stop_id) | |
8002 | return 1; | |
8003 | return 0; | |
8004 | } | |
8005 | ||
8006 | /* See infrun.h. */ | |
8007 | ||
8008 | int | |
96baa820 | 8009 | normal_stop (void) |
c906108c | 8010 | { |
73b65bb0 DJ |
8011 | struct target_waitstatus last; |
8012 | ptid_t last_ptid; | |
29f49a6a | 8013 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
e1316e60 | 8014 | ptid_t pid_ptid; |
73b65bb0 DJ |
8015 | |
8016 | get_last_target_status (&last_ptid, &last); | |
8017 | ||
4c2f2a79 PA |
8018 | new_stop_id (); |
8019 | ||
29f49a6a PA |
8020 | /* If an exception is thrown from this point on, make sure to |
8021 | propagate GDB's knowledge of the executing state to the | |
8022 | frontend/user running state. A QUIT is an easy exception to see | |
8023 | here, so do this before any filtered output. */ | |
c35b1492 PA |
8024 | if (!non_stop) |
8025 | make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
e1316e60 PA |
8026 | else if (last.kind == TARGET_WAITKIND_SIGNALLED |
8027 | || last.kind == TARGET_WAITKIND_EXITED) | |
8028 | { | |
8029 | /* On some targets, we may still have live threads in the | |
8030 | inferior when we get a process exit event. E.g., for | |
8031 | "checkpoint", when the current checkpoint/fork exits, | |
8032 | linux-fork.c automatically switches to another fork from | |
8033 | within target_mourn_inferior. */ | |
8034 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
8035 | { | |
8036 | pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
8037 | make_cleanup (finish_thread_state_cleanup, &pid_ptid); | |
8038 | } | |
8039 | } | |
8040 | else if (last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c35b1492 | 8041 | make_cleanup (finish_thread_state_cleanup, &inferior_ptid); |
29f49a6a | 8042 | |
b57bacec PA |
8043 | /* As we're presenting a stop, and potentially removing breakpoints, |
8044 | update the thread list so we can tell whether there are threads | |
8045 | running on the target. With target remote, for example, we can | |
8046 | only learn about new threads when we explicitly update the thread | |
8047 | list. Do this before notifying the interpreters about signal | |
8048 | stops, end of stepping ranges, etc., so that the "new thread" | |
8049 | output is emitted before e.g., "Program received signal FOO", | |
8050 | instead of after. */ | |
8051 | update_thread_list (); | |
8052 | ||
8053 | if (last.kind == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) | |
8054 | observer_notify_signal_received (inferior_thread ()->suspend.stop_signal); | |
8055 | ||
c906108c SS |
8056 | /* As with the notification of thread events, we want to delay |
8057 | notifying the user that we've switched thread context until | |
8058 | the inferior actually stops. | |
8059 | ||
73b65bb0 DJ |
8060 | There's no point in saying anything if the inferior has exited. |
8061 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
8062 | "received a signal". |
8063 | ||
8064 | Also skip saying anything in non-stop mode. In that mode, as we | |
8065 | don't want GDB to switch threads behind the user's back, to avoid | |
8066 | races where the user is typing a command to apply to thread x, | |
8067 | but GDB switches to thread y before the user finishes entering | |
8068 | the command, fetch_inferior_event installs a cleanup to restore | |
8069 | the current thread back to the thread the user had selected right | |
8070 | after this event is handled, so we're not really switching, only | |
8071 | informing of a stop. */ | |
4f8d22e3 PA |
8072 | if (!non_stop |
8073 | && !ptid_equal (previous_inferior_ptid, inferior_ptid) | |
73b65bb0 DJ |
8074 | && target_has_execution |
8075 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
8076 | && last.kind != TARGET_WAITKIND_EXITED |
8077 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c SS |
8078 | { |
8079 | target_terminal_ours_for_output (); | |
a3f17187 | 8080 | printf_filtered (_("[Switching to %s]\n"), |
c95310c6 | 8081 | target_pid_to_str (inferior_ptid)); |
b8fa951a | 8082 | annotate_thread_changed (); |
39f77062 | 8083 | previous_inferior_ptid = inferior_ptid; |
c906108c | 8084 | } |
c906108c | 8085 | |
0e5bf2a8 PA |
8086 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
8087 | { | |
8088 | gdb_assert (sync_execution || !target_can_async_p ()); | |
8089 | ||
8090 | target_terminal_ours_for_output (); | |
8091 | printf_filtered (_("No unwaited-for children left.\n")); | |
8092 | } | |
8093 | ||
b57bacec | 8094 | /* Note: this depends on the update_thread_list call above. */ |
388a7084 | 8095 | maybe_remove_breakpoints (); |
c906108c | 8096 | |
c906108c SS |
8097 | /* If an auto-display called a function and that got a signal, |
8098 | delete that auto-display to avoid an infinite recursion. */ | |
8099 | ||
8100 | if (stopped_by_random_signal) | |
8101 | disable_current_display (); | |
8102 | ||
c906108c | 8103 | target_terminal_ours (); |
0f641c01 | 8104 | async_enable_stdin (); |
c906108c | 8105 | |
388a7084 PA |
8106 | /* Let the user/frontend see the threads as stopped. */ |
8107 | do_cleanups (old_chain); | |
8108 | ||
8109 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
8110 | and current location is based on that. Handle the case where the | |
8111 | dummy call is returning after being stopped. E.g. the dummy call | |
8112 | previously hit a breakpoint. (If the dummy call returns | |
8113 | normally, we won't reach here.) Do this before the stop hook is | |
8114 | run, so that it doesn't get to see the temporary dummy frame, | |
8115 | which is not where we'll present the stop. */ | |
8116 | if (has_stack_frames ()) | |
8117 | { | |
8118 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
8119 | { | |
8120 | /* Pop the empty frame that contains the stack dummy. This | |
8121 | also restores inferior state prior to the call (struct | |
8122 | infcall_suspend_state). */ | |
8123 | struct frame_info *frame = get_current_frame (); | |
8124 | ||
8125 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
8126 | frame_pop (frame); | |
8127 | /* frame_pop calls reinit_frame_cache as the last thing it | |
8128 | does which means there's now no selected frame. */ | |
8129 | } | |
8130 | ||
8131 | select_frame (get_current_frame ()); | |
8132 | ||
8133 | /* Set the current source location. */ | |
8134 | set_current_sal_from_frame (get_current_frame ()); | |
8135 | } | |
dd7e2d2b PA |
8136 | |
8137 | /* Look up the hook_stop and run it (CLI internally handles problem | |
8138 | of stop_command's pre-hook not existing). */ | |
4c2f2a79 PA |
8139 | if (stop_command != NULL) |
8140 | { | |
8141 | struct stop_context *saved_context = save_stop_context (); | |
8142 | struct cleanup *old_chain | |
8143 | = make_cleanup (release_stop_context_cleanup, saved_context); | |
8144 | ||
8145 | catch_errors (hook_stop_stub, stop_command, | |
8146 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
8147 | ||
8148 | /* If the stop hook resumes the target, then there's no point in | |
8149 | trying to notify about the previous stop; its context is | |
8150 | gone. Likewise if the command switches thread or inferior -- | |
8151 | the observers would print a stop for the wrong | |
8152 | thread/inferior. */ | |
8153 | if (stop_context_changed (saved_context)) | |
8154 | { | |
8155 | do_cleanups (old_chain); | |
8156 | return 1; | |
8157 | } | |
8158 | do_cleanups (old_chain); | |
8159 | } | |
dd7e2d2b | 8160 | |
388a7084 PA |
8161 | /* Notify observers about the stop. This is where the interpreters |
8162 | print the stop event. */ | |
8163 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
8164 | observer_notify_normal_stop (inferior_thread ()->control.stop_bpstat, | |
8165 | stop_print_frame); | |
8166 | else | |
8167 | observer_notify_normal_stop (NULL, stop_print_frame); | |
347bddb7 | 8168 | |
243a9253 PA |
8169 | annotate_stopped (); |
8170 | ||
48844aa6 PA |
8171 | if (target_has_execution) |
8172 | { | |
8173 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
8174 | && last.kind != TARGET_WAITKIND_EXITED) | |
8175 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
8176 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 8177 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 8178 | } |
6c95b8df PA |
8179 | |
8180 | /* Try to get rid of automatically added inferiors that are no | |
8181 | longer needed. Keeping those around slows down things linearly. | |
8182 | Note that this never removes the current inferior. */ | |
8183 | prune_inferiors (); | |
4c2f2a79 PA |
8184 | |
8185 | return 0; | |
c906108c SS |
8186 | } |
8187 | ||
8188 | static int | |
96baa820 | 8189 | hook_stop_stub (void *cmd) |
c906108c | 8190 | { |
5913bcb0 | 8191 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
8192 | return (0); |
8193 | } | |
8194 | \f | |
c5aa993b | 8195 | int |
96baa820 | 8196 | signal_stop_state (int signo) |
c906108c | 8197 | { |
d6b48e9c | 8198 | return signal_stop[signo]; |
c906108c SS |
8199 | } |
8200 | ||
c5aa993b | 8201 | int |
96baa820 | 8202 | signal_print_state (int signo) |
c906108c SS |
8203 | { |
8204 | return signal_print[signo]; | |
8205 | } | |
8206 | ||
c5aa993b | 8207 | int |
96baa820 | 8208 | signal_pass_state (int signo) |
c906108c SS |
8209 | { |
8210 | return signal_program[signo]; | |
8211 | } | |
8212 | ||
2455069d UW |
8213 | static void |
8214 | signal_cache_update (int signo) | |
8215 | { | |
8216 | if (signo == -1) | |
8217 | { | |
a493e3e2 | 8218 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
8219 | signal_cache_update (signo); |
8220 | ||
8221 | return; | |
8222 | } | |
8223 | ||
8224 | signal_pass[signo] = (signal_stop[signo] == 0 | |
8225 | && signal_print[signo] == 0 | |
ab04a2af TT |
8226 | && signal_program[signo] == 1 |
8227 | && signal_catch[signo] == 0); | |
2455069d UW |
8228 | } |
8229 | ||
488f131b | 8230 | int |
7bda5e4a | 8231 | signal_stop_update (int signo, int state) |
d4f3574e SS |
8232 | { |
8233 | int ret = signal_stop[signo]; | |
abbb1732 | 8234 | |
d4f3574e | 8235 | signal_stop[signo] = state; |
2455069d | 8236 | signal_cache_update (signo); |
d4f3574e SS |
8237 | return ret; |
8238 | } | |
8239 | ||
488f131b | 8240 | int |
7bda5e4a | 8241 | signal_print_update (int signo, int state) |
d4f3574e SS |
8242 | { |
8243 | int ret = signal_print[signo]; | |
abbb1732 | 8244 | |
d4f3574e | 8245 | signal_print[signo] = state; |
2455069d | 8246 | signal_cache_update (signo); |
d4f3574e SS |
8247 | return ret; |
8248 | } | |
8249 | ||
488f131b | 8250 | int |
7bda5e4a | 8251 | signal_pass_update (int signo, int state) |
d4f3574e SS |
8252 | { |
8253 | int ret = signal_program[signo]; | |
abbb1732 | 8254 | |
d4f3574e | 8255 | signal_program[signo] = state; |
2455069d | 8256 | signal_cache_update (signo); |
d4f3574e SS |
8257 | return ret; |
8258 | } | |
8259 | ||
ab04a2af TT |
8260 | /* Update the global 'signal_catch' from INFO and notify the |
8261 | target. */ | |
8262 | ||
8263 | void | |
8264 | signal_catch_update (const unsigned int *info) | |
8265 | { | |
8266 | int i; | |
8267 | ||
8268 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
8269 | signal_catch[i] = info[i] > 0; | |
8270 | signal_cache_update (-1); | |
8271 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); | |
8272 | } | |
8273 | ||
c906108c | 8274 | static void |
96baa820 | 8275 | sig_print_header (void) |
c906108c | 8276 | { |
3e43a32a MS |
8277 | printf_filtered (_("Signal Stop\tPrint\tPass " |
8278 | "to program\tDescription\n")); | |
c906108c SS |
8279 | } |
8280 | ||
8281 | static void | |
2ea28649 | 8282 | sig_print_info (enum gdb_signal oursig) |
c906108c | 8283 | { |
2ea28649 | 8284 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 8285 | int name_padding = 13 - strlen (name); |
96baa820 | 8286 | |
c906108c SS |
8287 | if (name_padding <= 0) |
8288 | name_padding = 0; | |
8289 | ||
8290 | printf_filtered ("%s", name); | |
488f131b | 8291 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
8292 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
8293 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
8294 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
2ea28649 | 8295 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); |
c906108c SS |
8296 | } |
8297 | ||
8298 | /* Specify how various signals in the inferior should be handled. */ | |
8299 | ||
8300 | static void | |
96baa820 | 8301 | handle_command (char *args, int from_tty) |
c906108c SS |
8302 | { |
8303 | char **argv; | |
8304 | int digits, wordlen; | |
8305 | int sigfirst, signum, siglast; | |
2ea28649 | 8306 | enum gdb_signal oursig; |
c906108c SS |
8307 | int allsigs; |
8308 | int nsigs; | |
8309 | unsigned char *sigs; | |
8310 | struct cleanup *old_chain; | |
8311 | ||
8312 | if (args == NULL) | |
8313 | { | |
e2e0b3e5 | 8314 | error_no_arg (_("signal to handle")); |
c906108c SS |
8315 | } |
8316 | ||
1777feb0 | 8317 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 8318 | |
a493e3e2 | 8319 | nsigs = (int) GDB_SIGNAL_LAST; |
c906108c SS |
8320 | sigs = (unsigned char *) alloca (nsigs); |
8321 | memset (sigs, 0, nsigs); | |
8322 | ||
1777feb0 | 8323 | /* Break the command line up into args. */ |
c906108c | 8324 | |
d1a41061 | 8325 | argv = gdb_buildargv (args); |
7a292a7a | 8326 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
8327 | |
8328 | /* Walk through the args, looking for signal oursigs, signal names, and | |
8329 | actions. Signal numbers and signal names may be interspersed with | |
8330 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 8331 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c SS |
8332 | |
8333 | while (*argv != NULL) | |
8334 | { | |
8335 | wordlen = strlen (*argv); | |
8336 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
8337 | {; | |
8338 | } | |
8339 | allsigs = 0; | |
8340 | sigfirst = siglast = -1; | |
8341 | ||
8342 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
8343 | { | |
8344 | /* Apply action to all signals except those used by the | |
1777feb0 | 8345 | debugger. Silently skip those. */ |
c906108c SS |
8346 | allsigs = 1; |
8347 | sigfirst = 0; | |
8348 | siglast = nsigs - 1; | |
8349 | } | |
8350 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
8351 | { | |
8352 | SET_SIGS (nsigs, sigs, signal_stop); | |
8353 | SET_SIGS (nsigs, sigs, signal_print); | |
8354 | } | |
8355 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
8356 | { | |
8357 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8358 | } | |
8359 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
8360 | { | |
8361 | SET_SIGS (nsigs, sigs, signal_print); | |
8362 | } | |
8363 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
8364 | { | |
8365 | SET_SIGS (nsigs, sigs, signal_program); | |
8366 | } | |
8367 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
8368 | { | |
8369 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8370 | } | |
8371 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
8372 | { | |
8373 | SET_SIGS (nsigs, sigs, signal_program); | |
8374 | } | |
8375 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
8376 | { | |
8377 | UNSET_SIGS (nsigs, sigs, signal_print); | |
8378 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8379 | } | |
8380 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
8381 | { | |
8382 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8383 | } | |
8384 | else if (digits > 0) | |
8385 | { | |
8386 | /* It is numeric. The numeric signal refers to our own | |
8387 | internal signal numbering from target.h, not to host/target | |
8388 | signal number. This is a feature; users really should be | |
8389 | using symbolic names anyway, and the common ones like | |
8390 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
8391 | ||
8392 | sigfirst = siglast = (int) | |
2ea28649 | 8393 | gdb_signal_from_command (atoi (*argv)); |
c906108c SS |
8394 | if ((*argv)[digits] == '-') |
8395 | { | |
8396 | siglast = (int) | |
2ea28649 | 8397 | gdb_signal_from_command (atoi ((*argv) + digits + 1)); |
c906108c SS |
8398 | } |
8399 | if (sigfirst > siglast) | |
8400 | { | |
1777feb0 | 8401 | /* Bet he didn't figure we'd think of this case... */ |
c906108c SS |
8402 | signum = sigfirst; |
8403 | sigfirst = siglast; | |
8404 | siglast = signum; | |
8405 | } | |
8406 | } | |
8407 | else | |
8408 | { | |
2ea28649 | 8409 | oursig = gdb_signal_from_name (*argv); |
a493e3e2 | 8410 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8411 | { |
8412 | sigfirst = siglast = (int) oursig; | |
8413 | } | |
8414 | else | |
8415 | { | |
8416 | /* Not a number and not a recognized flag word => complain. */ | |
8a3fe4f8 | 8417 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv); |
c906108c SS |
8418 | } |
8419 | } | |
8420 | ||
8421 | /* If any signal numbers or symbol names were found, set flags for | |
1777feb0 | 8422 | which signals to apply actions to. */ |
c906108c SS |
8423 | |
8424 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
8425 | { | |
2ea28649 | 8426 | switch ((enum gdb_signal) signum) |
c906108c | 8427 | { |
a493e3e2 PA |
8428 | case GDB_SIGNAL_TRAP: |
8429 | case GDB_SIGNAL_INT: | |
c906108c SS |
8430 | if (!allsigs && !sigs[signum]) |
8431 | { | |
9e2f0ad4 | 8432 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 8433 | Are you sure you want to change it? "), |
2ea28649 | 8434 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
8435 | { |
8436 | sigs[signum] = 1; | |
8437 | } | |
8438 | else | |
8439 | { | |
a3f17187 | 8440 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
8441 | gdb_flush (gdb_stdout); |
8442 | } | |
8443 | } | |
8444 | break; | |
a493e3e2 PA |
8445 | case GDB_SIGNAL_0: |
8446 | case GDB_SIGNAL_DEFAULT: | |
8447 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
8448 | /* Make sure that "all" doesn't print these. */ |
8449 | break; | |
8450 | default: | |
8451 | sigs[signum] = 1; | |
8452 | break; | |
8453 | } | |
8454 | } | |
8455 | ||
8456 | argv++; | |
8457 | } | |
8458 | ||
3a031f65 PA |
8459 | for (signum = 0; signum < nsigs; signum++) |
8460 | if (sigs[signum]) | |
8461 | { | |
2455069d | 8462 | signal_cache_update (-1); |
a493e3e2 PA |
8463 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); |
8464 | target_program_signals ((int) GDB_SIGNAL_LAST, signal_program); | |
c906108c | 8465 | |
3a031f65 PA |
8466 | if (from_tty) |
8467 | { | |
8468 | /* Show the results. */ | |
8469 | sig_print_header (); | |
8470 | for (; signum < nsigs; signum++) | |
8471 | if (sigs[signum]) | |
aead7601 | 8472 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
8473 | } |
8474 | ||
8475 | break; | |
8476 | } | |
c906108c SS |
8477 | |
8478 | do_cleanups (old_chain); | |
8479 | } | |
8480 | ||
de0bea00 MF |
8481 | /* Complete the "handle" command. */ |
8482 | ||
8483 | static VEC (char_ptr) * | |
8484 | handle_completer (struct cmd_list_element *ignore, | |
6f937416 | 8485 | const char *text, const char *word) |
de0bea00 MF |
8486 | { |
8487 | VEC (char_ptr) *vec_signals, *vec_keywords, *return_val; | |
8488 | static const char * const keywords[] = | |
8489 | { | |
8490 | "all", | |
8491 | "stop", | |
8492 | "ignore", | |
8493 | "print", | |
8494 | "pass", | |
8495 | "nostop", | |
8496 | "noignore", | |
8497 | "noprint", | |
8498 | "nopass", | |
8499 | NULL, | |
8500 | }; | |
8501 | ||
8502 | vec_signals = signal_completer (ignore, text, word); | |
8503 | vec_keywords = complete_on_enum (keywords, word, word); | |
8504 | ||
8505 | return_val = VEC_merge (char_ptr, vec_signals, vec_keywords); | |
8506 | VEC_free (char_ptr, vec_signals); | |
8507 | VEC_free (char_ptr, vec_keywords); | |
8508 | return return_val; | |
8509 | } | |
8510 | ||
2ea28649 PA |
8511 | enum gdb_signal |
8512 | gdb_signal_from_command (int num) | |
ed01b82c PA |
8513 | { |
8514 | if (num >= 1 && num <= 15) | |
2ea28649 | 8515 | return (enum gdb_signal) num; |
ed01b82c PA |
8516 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
8517 | Use \"info signals\" for a list of symbolic signals.")); | |
8518 | } | |
8519 | ||
c906108c SS |
8520 | /* Print current contents of the tables set by the handle command. |
8521 | It is possible we should just be printing signals actually used | |
8522 | by the current target (but for things to work right when switching | |
8523 | targets, all signals should be in the signal tables). */ | |
8524 | ||
8525 | static void | |
96baa820 | 8526 | signals_info (char *signum_exp, int from_tty) |
c906108c | 8527 | { |
2ea28649 | 8528 | enum gdb_signal oursig; |
abbb1732 | 8529 | |
c906108c SS |
8530 | sig_print_header (); |
8531 | ||
8532 | if (signum_exp) | |
8533 | { | |
8534 | /* First see if this is a symbol name. */ | |
2ea28649 | 8535 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 8536 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8537 | { |
8538 | /* No, try numeric. */ | |
8539 | oursig = | |
2ea28649 | 8540 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
8541 | } |
8542 | sig_print_info (oursig); | |
8543 | return; | |
8544 | } | |
8545 | ||
8546 | printf_filtered ("\n"); | |
8547 | /* These ugly casts brought to you by the native VAX compiler. */ | |
a493e3e2 PA |
8548 | for (oursig = GDB_SIGNAL_FIRST; |
8549 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 8550 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
8551 | { |
8552 | QUIT; | |
8553 | ||
a493e3e2 PA |
8554 | if (oursig != GDB_SIGNAL_UNKNOWN |
8555 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
8556 | sig_print_info (oursig); |
8557 | } | |
8558 | ||
3e43a32a MS |
8559 | printf_filtered (_("\nUse the \"handle\" command " |
8560 | "to change these tables.\n")); | |
c906108c | 8561 | } |
4aa995e1 | 8562 | |
c709acd1 PA |
8563 | /* Check if it makes sense to read $_siginfo from the current thread |
8564 | at this point. If not, throw an error. */ | |
8565 | ||
8566 | static void | |
8567 | validate_siginfo_access (void) | |
8568 | { | |
8569 | /* No current inferior, no siginfo. */ | |
8570 | if (ptid_equal (inferior_ptid, null_ptid)) | |
8571 | error (_("No thread selected.")); | |
8572 | ||
8573 | /* Don't try to read from a dead thread. */ | |
8574 | if (is_exited (inferior_ptid)) | |
8575 | error (_("The current thread has terminated")); | |
8576 | ||
8577 | /* ... or from a spinning thread. */ | |
8578 | if (is_running (inferior_ptid)) | |
8579 | error (_("Selected thread is running.")); | |
8580 | } | |
8581 | ||
4aa995e1 PA |
8582 | /* The $_siginfo convenience variable is a bit special. We don't know |
8583 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 8584 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
8585 | also dependent on which thread you have selected. |
8586 | ||
8587 | 1. making $_siginfo be an internalvar that creates a new value on | |
8588 | access. | |
8589 | ||
8590 | 2. making the value of $_siginfo be an lval_computed value. */ | |
8591 | ||
8592 | /* This function implements the lval_computed support for reading a | |
8593 | $_siginfo value. */ | |
8594 | ||
8595 | static void | |
8596 | siginfo_value_read (struct value *v) | |
8597 | { | |
8598 | LONGEST transferred; | |
8599 | ||
c709acd1 PA |
8600 | validate_siginfo_access (); |
8601 | ||
4aa995e1 PA |
8602 | transferred = |
8603 | target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, | |
8604 | NULL, | |
8605 | value_contents_all_raw (v), | |
8606 | value_offset (v), | |
8607 | TYPE_LENGTH (value_type (v))); | |
8608 | ||
8609 | if (transferred != TYPE_LENGTH (value_type (v))) | |
8610 | error (_("Unable to read siginfo")); | |
8611 | } | |
8612 | ||
8613 | /* This function implements the lval_computed support for writing a | |
8614 | $_siginfo value. */ | |
8615 | ||
8616 | static void | |
8617 | siginfo_value_write (struct value *v, struct value *fromval) | |
8618 | { | |
8619 | LONGEST transferred; | |
8620 | ||
c709acd1 PA |
8621 | validate_siginfo_access (); |
8622 | ||
4aa995e1 PA |
8623 | transferred = target_write (¤t_target, |
8624 | TARGET_OBJECT_SIGNAL_INFO, | |
8625 | NULL, | |
8626 | value_contents_all_raw (fromval), | |
8627 | value_offset (v), | |
8628 | TYPE_LENGTH (value_type (fromval))); | |
8629 | ||
8630 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
8631 | error (_("Unable to write siginfo")); | |
8632 | } | |
8633 | ||
c8f2448a | 8634 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
8635 | { |
8636 | siginfo_value_read, | |
8637 | siginfo_value_write | |
8638 | }; | |
8639 | ||
8640 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
8641 | the current thread using architecture GDBARCH. Return a void value |
8642 | if there's no object available. */ | |
4aa995e1 | 8643 | |
2c0b251b | 8644 | static struct value * |
22d2b532 SDJ |
8645 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
8646 | void *ignore) | |
4aa995e1 | 8647 | { |
4aa995e1 | 8648 | if (target_has_stack |
78267919 UW |
8649 | && !ptid_equal (inferior_ptid, null_ptid) |
8650 | && gdbarch_get_siginfo_type_p (gdbarch)) | |
4aa995e1 | 8651 | { |
78267919 | 8652 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 8653 | |
78267919 | 8654 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
8655 | } |
8656 | ||
78267919 | 8657 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
8658 | } |
8659 | ||
c906108c | 8660 | \f |
16c381f0 JK |
8661 | /* infcall_suspend_state contains state about the program itself like its |
8662 | registers and any signal it received when it last stopped. | |
8663 | This state must be restored regardless of how the inferior function call | |
8664 | ends (either successfully, or after it hits a breakpoint or signal) | |
8665 | if the program is to properly continue where it left off. */ | |
8666 | ||
8667 | struct infcall_suspend_state | |
7a292a7a | 8668 | { |
16c381f0 | 8669 | struct thread_suspend_state thread_suspend; |
16c381f0 JK |
8670 | |
8671 | /* Other fields: */ | |
7a292a7a | 8672 | CORE_ADDR stop_pc; |
b89667eb | 8673 | struct regcache *registers; |
1736ad11 | 8674 | |
35515841 | 8675 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
1736ad11 JK |
8676 | struct gdbarch *siginfo_gdbarch; |
8677 | ||
8678 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
8679 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
8680 | content would be invalid. */ | |
8681 | gdb_byte *siginfo_data; | |
b89667eb DE |
8682 | }; |
8683 | ||
16c381f0 JK |
8684 | struct infcall_suspend_state * |
8685 | save_infcall_suspend_state (void) | |
b89667eb | 8686 | { |
16c381f0 | 8687 | struct infcall_suspend_state *inf_state; |
b89667eb | 8688 | struct thread_info *tp = inferior_thread (); |
1736ad11 JK |
8689 | struct regcache *regcache = get_current_regcache (); |
8690 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
8691 | gdb_byte *siginfo_data = NULL; | |
8692 | ||
8693 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
8694 | { | |
8695 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
8696 | size_t len = TYPE_LENGTH (type); | |
8697 | struct cleanup *back_to; | |
8698 | ||
224c3ddb | 8699 | siginfo_data = (gdb_byte *) xmalloc (len); |
1736ad11 JK |
8700 | back_to = make_cleanup (xfree, siginfo_data); |
8701 | ||
8702 | if (target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8703 | siginfo_data, 0, len) == len) | |
8704 | discard_cleanups (back_to); | |
8705 | else | |
8706 | { | |
8707 | /* Errors ignored. */ | |
8708 | do_cleanups (back_to); | |
8709 | siginfo_data = NULL; | |
8710 | } | |
8711 | } | |
8712 | ||
41bf6aca | 8713 | inf_state = XCNEW (struct infcall_suspend_state); |
1736ad11 JK |
8714 | |
8715 | if (siginfo_data) | |
8716 | { | |
8717 | inf_state->siginfo_gdbarch = gdbarch; | |
8718 | inf_state->siginfo_data = siginfo_data; | |
8719 | } | |
b89667eb | 8720 | |
16c381f0 | 8721 | inf_state->thread_suspend = tp->suspend; |
16c381f0 | 8722 | |
35515841 | 8723 | /* run_inferior_call will not use the signal due to its `proceed' call with |
a493e3e2 PA |
8724 | GDB_SIGNAL_0 anyway. */ |
8725 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
35515841 | 8726 | |
b89667eb DE |
8727 | inf_state->stop_pc = stop_pc; |
8728 | ||
1736ad11 | 8729 | inf_state->registers = regcache_dup (regcache); |
b89667eb DE |
8730 | |
8731 | return inf_state; | |
8732 | } | |
8733 | ||
8734 | /* Restore inferior session state to INF_STATE. */ | |
8735 | ||
8736 | void | |
16c381f0 | 8737 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8738 | { |
8739 | struct thread_info *tp = inferior_thread (); | |
1736ad11 JK |
8740 | struct regcache *regcache = get_current_regcache (); |
8741 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
b89667eb | 8742 | |
16c381f0 | 8743 | tp->suspend = inf_state->thread_suspend; |
16c381f0 | 8744 | |
b89667eb DE |
8745 | stop_pc = inf_state->stop_pc; |
8746 | ||
1736ad11 JK |
8747 | if (inf_state->siginfo_gdbarch == gdbarch) |
8748 | { | |
8749 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
1736ad11 JK |
8750 | |
8751 | /* Errors ignored. */ | |
8752 | target_write (¤t_target, TARGET_OBJECT_SIGNAL_INFO, NULL, | |
6acef6cd | 8753 | inf_state->siginfo_data, 0, TYPE_LENGTH (type)); |
1736ad11 JK |
8754 | } |
8755 | ||
b89667eb DE |
8756 | /* The inferior can be gone if the user types "print exit(0)" |
8757 | (and perhaps other times). */ | |
8758 | if (target_has_execution) | |
8759 | /* NB: The register write goes through to the target. */ | |
1736ad11 | 8760 | regcache_cpy (regcache, inf_state->registers); |
803b5f95 | 8761 | |
16c381f0 | 8762 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
8763 | } |
8764 | ||
8765 | static void | |
16c381f0 | 8766 | do_restore_infcall_suspend_state_cleanup (void *state) |
b89667eb | 8767 | { |
9a3c8263 | 8768 | restore_infcall_suspend_state ((struct infcall_suspend_state *) state); |
b89667eb DE |
8769 | } |
8770 | ||
8771 | struct cleanup * | |
16c381f0 JK |
8772 | make_cleanup_restore_infcall_suspend_state |
8773 | (struct infcall_suspend_state *inf_state) | |
b89667eb | 8774 | { |
16c381f0 | 8775 | return make_cleanup (do_restore_infcall_suspend_state_cleanup, inf_state); |
b89667eb DE |
8776 | } |
8777 | ||
8778 | void | |
16c381f0 | 8779 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8780 | { |
8781 | regcache_xfree (inf_state->registers); | |
803b5f95 | 8782 | xfree (inf_state->siginfo_data); |
b89667eb DE |
8783 | xfree (inf_state); |
8784 | } | |
8785 | ||
8786 | struct regcache * | |
16c381f0 | 8787 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8788 | { |
8789 | return inf_state->registers; | |
8790 | } | |
8791 | ||
16c381f0 JK |
8792 | /* infcall_control_state contains state regarding gdb's control of the |
8793 | inferior itself like stepping control. It also contains session state like | |
8794 | the user's currently selected frame. */ | |
b89667eb | 8795 | |
16c381f0 | 8796 | struct infcall_control_state |
b89667eb | 8797 | { |
16c381f0 JK |
8798 | struct thread_control_state thread_control; |
8799 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
8800 | |
8801 | /* Other fields: */ | |
8802 | enum stop_stack_kind stop_stack_dummy; | |
8803 | int stopped_by_random_signal; | |
7a292a7a | 8804 | |
b89667eb | 8805 | /* ID if the selected frame when the inferior function call was made. */ |
101dcfbe | 8806 | struct frame_id selected_frame_id; |
7a292a7a SS |
8807 | }; |
8808 | ||
c906108c | 8809 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 8810 | connection. */ |
c906108c | 8811 | |
16c381f0 JK |
8812 | struct infcall_control_state * |
8813 | save_infcall_control_state (void) | |
c906108c | 8814 | { |
8d749320 SM |
8815 | struct infcall_control_state *inf_status = |
8816 | XNEW (struct infcall_control_state); | |
4e1c45ea | 8817 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 8818 | struct inferior *inf = current_inferior (); |
7a292a7a | 8819 | |
16c381f0 JK |
8820 | inf_status->thread_control = tp->control; |
8821 | inf_status->inferior_control = inf->control; | |
d82142e2 | 8822 | |
8358c15c | 8823 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 8824 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 8825 | |
16c381f0 JK |
8826 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
8827 | chain. If caller's caller is walking the chain, they'll be happier if we | |
8828 | hand them back the original chain when restore_infcall_control_state is | |
8829 | called. */ | |
8830 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
8831 | |
8832 | /* Other fields: */ | |
8833 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
8834 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
c5aa993b | 8835 | |
206415a3 | 8836 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
b89667eb | 8837 | |
7a292a7a | 8838 | return inf_status; |
c906108c SS |
8839 | } |
8840 | ||
c906108c | 8841 | static int |
96baa820 | 8842 | restore_selected_frame (void *args) |
c906108c | 8843 | { |
488f131b | 8844 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 8845 | struct frame_info *frame; |
c906108c | 8846 | |
101dcfbe | 8847 | frame = frame_find_by_id (*fid); |
c906108c | 8848 | |
aa0cd9c1 AC |
8849 | /* If inf_status->selected_frame_id is NULL, there was no previously |
8850 | selected frame. */ | |
101dcfbe | 8851 | if (frame == NULL) |
c906108c | 8852 | { |
8a3fe4f8 | 8853 | warning (_("Unable to restore previously selected frame.")); |
c906108c SS |
8854 | return 0; |
8855 | } | |
8856 | ||
0f7d239c | 8857 | select_frame (frame); |
c906108c SS |
8858 | |
8859 | return (1); | |
8860 | } | |
8861 | ||
b89667eb DE |
8862 | /* Restore inferior session state to INF_STATUS. */ |
8863 | ||
c906108c | 8864 | void |
16c381f0 | 8865 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 8866 | { |
4e1c45ea | 8867 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 8868 | struct inferior *inf = current_inferior (); |
4e1c45ea | 8869 | |
8358c15c JK |
8870 | if (tp->control.step_resume_breakpoint) |
8871 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
8872 | ||
5b79abe7 TT |
8873 | if (tp->control.exception_resume_breakpoint) |
8874 | tp->control.exception_resume_breakpoint->disposition | |
8875 | = disp_del_at_next_stop; | |
8876 | ||
d82142e2 | 8877 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 8878 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 8879 | |
16c381f0 JK |
8880 | tp->control = inf_status->thread_control; |
8881 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
8882 | |
8883 | /* Other fields: */ | |
8884 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
8885 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
c906108c | 8886 | |
b89667eb | 8887 | if (target_has_stack) |
c906108c | 8888 | { |
c906108c | 8889 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
8890 | walking the stack might encounter a garbage pointer and |
8891 | error() trying to dereference it. */ | |
488f131b JB |
8892 | if (catch_errors |
8893 | (restore_selected_frame, &inf_status->selected_frame_id, | |
8894 | "Unable to restore previously selected frame:\n", | |
8895 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
8896 | /* Error in restoring the selected frame. Select the innermost |
8897 | frame. */ | |
0f7d239c | 8898 | select_frame (get_current_frame ()); |
c906108c | 8899 | } |
c906108c | 8900 | |
72cec141 | 8901 | xfree (inf_status); |
7a292a7a | 8902 | } |
c906108c | 8903 | |
74b7792f | 8904 | static void |
16c381f0 | 8905 | do_restore_infcall_control_state_cleanup (void *sts) |
74b7792f | 8906 | { |
9a3c8263 | 8907 | restore_infcall_control_state ((struct infcall_control_state *) sts); |
74b7792f AC |
8908 | } |
8909 | ||
8910 | struct cleanup * | |
16c381f0 JK |
8911 | make_cleanup_restore_infcall_control_state |
8912 | (struct infcall_control_state *inf_status) | |
74b7792f | 8913 | { |
16c381f0 | 8914 | return make_cleanup (do_restore_infcall_control_state_cleanup, inf_status); |
74b7792f AC |
8915 | } |
8916 | ||
c906108c | 8917 | void |
16c381f0 | 8918 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 8919 | { |
8358c15c JK |
8920 | if (inf_status->thread_control.step_resume_breakpoint) |
8921 | inf_status->thread_control.step_resume_breakpoint->disposition | |
8922 | = disp_del_at_next_stop; | |
8923 | ||
5b79abe7 TT |
8924 | if (inf_status->thread_control.exception_resume_breakpoint) |
8925 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
8926 | = disp_del_at_next_stop; | |
8927 | ||
1777feb0 | 8928 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 8929 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 8930 | |
72cec141 | 8931 | xfree (inf_status); |
7a292a7a | 8932 | } |
b89667eb | 8933 | \f |
ca6724c1 KB |
8934 | /* restore_inferior_ptid() will be used by the cleanup machinery |
8935 | to restore the inferior_ptid value saved in a call to | |
8936 | save_inferior_ptid(). */ | |
ce696e05 KB |
8937 | |
8938 | static void | |
8939 | restore_inferior_ptid (void *arg) | |
8940 | { | |
9a3c8263 | 8941 | ptid_t *saved_ptid_ptr = (ptid_t *) arg; |
abbb1732 | 8942 | |
ce696e05 KB |
8943 | inferior_ptid = *saved_ptid_ptr; |
8944 | xfree (arg); | |
8945 | } | |
8946 | ||
8947 | /* Save the value of inferior_ptid so that it may be restored by a | |
8948 | later call to do_cleanups(). Returns the struct cleanup pointer | |
8949 | needed for later doing the cleanup. */ | |
8950 | ||
8951 | struct cleanup * | |
8952 | save_inferior_ptid (void) | |
8953 | { | |
8d749320 | 8954 | ptid_t *saved_ptid_ptr = XNEW (ptid_t); |
ce696e05 | 8955 | |
ce696e05 KB |
8956 | *saved_ptid_ptr = inferior_ptid; |
8957 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
8958 | } | |
0c557179 | 8959 | |
7f89fd65 | 8960 | /* See infrun.h. */ |
0c557179 SDJ |
8961 | |
8962 | void | |
8963 | clear_exit_convenience_vars (void) | |
8964 | { | |
8965 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
8966 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
8967 | } | |
c5aa993b | 8968 | \f |
488f131b | 8969 | |
b2175913 MS |
8970 | /* User interface for reverse debugging: |
8971 | Set exec-direction / show exec-direction commands | |
8972 | (returns error unless target implements to_set_exec_direction method). */ | |
8973 | ||
170742de | 8974 | enum exec_direction_kind execution_direction = EXEC_FORWARD; |
b2175913 MS |
8975 | static const char exec_forward[] = "forward"; |
8976 | static const char exec_reverse[] = "reverse"; | |
8977 | static const char *exec_direction = exec_forward; | |
40478521 | 8978 | static const char *const exec_direction_names[] = { |
b2175913 MS |
8979 | exec_forward, |
8980 | exec_reverse, | |
8981 | NULL | |
8982 | }; | |
8983 | ||
8984 | static void | |
8985 | set_exec_direction_func (char *args, int from_tty, | |
8986 | struct cmd_list_element *cmd) | |
8987 | { | |
8988 | if (target_can_execute_reverse) | |
8989 | { | |
8990 | if (!strcmp (exec_direction, exec_forward)) | |
8991 | execution_direction = EXEC_FORWARD; | |
8992 | else if (!strcmp (exec_direction, exec_reverse)) | |
8993 | execution_direction = EXEC_REVERSE; | |
8994 | } | |
8bbed405 MS |
8995 | else |
8996 | { | |
8997 | exec_direction = exec_forward; | |
8998 | error (_("Target does not support this operation.")); | |
8999 | } | |
b2175913 MS |
9000 | } |
9001 | ||
9002 | static void | |
9003 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
9004 | struct cmd_list_element *cmd, const char *value) | |
9005 | { | |
9006 | switch (execution_direction) { | |
9007 | case EXEC_FORWARD: | |
9008 | fprintf_filtered (out, _("Forward.\n")); | |
9009 | break; | |
9010 | case EXEC_REVERSE: | |
9011 | fprintf_filtered (out, _("Reverse.\n")); | |
9012 | break; | |
b2175913 | 9013 | default: |
d8b34453 PA |
9014 | internal_error (__FILE__, __LINE__, |
9015 | _("bogus execution_direction value: %d"), | |
9016 | (int) execution_direction); | |
b2175913 MS |
9017 | } |
9018 | } | |
9019 | ||
d4db2f36 PA |
9020 | static void |
9021 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
9022 | struct cmd_list_element *c, const char *value) | |
9023 | { | |
3e43a32a MS |
9024 | fprintf_filtered (file, _("Resuming the execution of threads " |
9025 | "of all processes is %s.\n"), value); | |
d4db2f36 | 9026 | } |
ad52ddc6 | 9027 | |
22d2b532 SDJ |
9028 | /* Implementation of `siginfo' variable. */ |
9029 | ||
9030 | static const struct internalvar_funcs siginfo_funcs = | |
9031 | { | |
9032 | siginfo_make_value, | |
9033 | NULL, | |
9034 | NULL | |
9035 | }; | |
9036 | ||
372316f1 PA |
9037 | /* Callback for infrun's target events source. This is marked when a |
9038 | thread has a pending status to process. */ | |
9039 | ||
9040 | static void | |
9041 | infrun_async_inferior_event_handler (gdb_client_data data) | |
9042 | { | |
372316f1 PA |
9043 | inferior_event_handler (INF_REG_EVENT, NULL); |
9044 | } | |
9045 | ||
c906108c | 9046 | void |
96baa820 | 9047 | _initialize_infrun (void) |
c906108c | 9048 | { |
52f0bd74 AC |
9049 | int i; |
9050 | int numsigs; | |
de0bea00 | 9051 | struct cmd_list_element *c; |
c906108c | 9052 | |
372316f1 PA |
9053 | /* Register extra event sources in the event loop. */ |
9054 | infrun_async_inferior_event_token | |
9055 | = create_async_event_handler (infrun_async_inferior_event_handler, NULL); | |
9056 | ||
1bedd215 AC |
9057 | add_info ("signals", signals_info, _("\ |
9058 | What debugger does when program gets various signals.\n\ | |
9059 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
9060 | add_info_alias ("handle", "signals", 0); |
9061 | ||
de0bea00 | 9062 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 9063 | Specify how to handle signals.\n\ |
486c7739 | 9064 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 9065 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 9066 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
9067 | will be displayed instead.\n\ |
9068 | \n\ | |
c906108c SS |
9069 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
9070 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
9071 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
9072 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 9073 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 9074 | \n\ |
1bedd215 | 9075 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
9076 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
9077 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
9078 | Print means print a message if this signal happens.\n\ | |
9079 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
9080 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
9081 | Pass and Stop may be combined.\n\ |
9082 | \n\ | |
9083 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
9084 | may be interspersed with actions, with the actions being performed for\n\ | |
9085 | all signals cumulatively specified.")); | |
de0bea00 | 9086 | set_cmd_completer (c, handle_completer); |
486c7739 | 9087 | |
c906108c | 9088 | if (!dbx_commands) |
1a966eab AC |
9089 | stop_command = add_cmd ("stop", class_obscure, |
9090 | not_just_help_class_command, _("\ | |
9091 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 9092 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 9093 | of the program stops."), &cmdlist); |
c906108c | 9094 | |
ccce17b0 | 9095 | add_setshow_zuinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
85c07804 AC |
9096 | Set inferior debugging."), _("\ |
9097 | Show inferior debugging."), _("\ | |
9098 | When non-zero, inferior specific debugging is enabled."), | |
ccce17b0 YQ |
9099 | NULL, |
9100 | show_debug_infrun, | |
9101 | &setdebuglist, &showdebuglist); | |
527159b7 | 9102 | |
3e43a32a MS |
9103 | add_setshow_boolean_cmd ("displaced", class_maintenance, |
9104 | &debug_displaced, _("\ | |
237fc4c9 PA |
9105 | Set displaced stepping debugging."), _("\ |
9106 | Show displaced stepping debugging."), _("\ | |
9107 | When non-zero, displaced stepping specific debugging is enabled."), | |
9108 | NULL, | |
9109 | show_debug_displaced, | |
9110 | &setdebuglist, &showdebuglist); | |
9111 | ||
ad52ddc6 PA |
9112 | add_setshow_boolean_cmd ("non-stop", no_class, |
9113 | &non_stop_1, _("\ | |
9114 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
9115 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
9116 | When debugging a multi-threaded program and this setting is\n\ | |
9117 | off (the default, also called all-stop mode), when one thread stops\n\ | |
9118 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
9119 | all other threads in the program while you interact with the thread of\n\ | |
9120 | interest. When you continue or step a thread, you can allow the other\n\ | |
9121 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
9122 | thread's state, all threads stop.\n\ | |
9123 | \n\ | |
9124 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
9125 | to run freely. You'll be able to step each thread independently,\n\ | |
9126 | leave it stopped or free to run as needed."), | |
9127 | set_non_stop, | |
9128 | show_non_stop, | |
9129 | &setlist, | |
9130 | &showlist); | |
9131 | ||
a493e3e2 | 9132 | numsigs = (int) GDB_SIGNAL_LAST; |
8d749320 SM |
9133 | signal_stop = XNEWVEC (unsigned char, numsigs); |
9134 | signal_print = XNEWVEC (unsigned char, numsigs); | |
9135 | signal_program = XNEWVEC (unsigned char, numsigs); | |
9136 | signal_catch = XNEWVEC (unsigned char, numsigs); | |
9137 | signal_pass = XNEWVEC (unsigned char, numsigs); | |
c906108c SS |
9138 | for (i = 0; i < numsigs; i++) |
9139 | { | |
9140 | signal_stop[i] = 1; | |
9141 | signal_print[i] = 1; | |
9142 | signal_program[i] = 1; | |
ab04a2af | 9143 | signal_catch[i] = 0; |
c906108c SS |
9144 | } |
9145 | ||
4d9d9d04 PA |
9146 | /* Signals caused by debugger's own actions should not be given to |
9147 | the program afterwards. | |
9148 | ||
9149 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
9150 | explicitly specifies that it should be delivered to the target | |
9151 | program. Typically, that would occur when a user is debugging a | |
9152 | target monitor on a simulator: the target monitor sets a | |
9153 | breakpoint; the simulator encounters this breakpoint and halts | |
9154 | the simulation handing control to GDB; GDB, noting that the stop | |
9155 | address doesn't map to any known breakpoint, returns control back | |
9156 | to the simulator; the simulator then delivers the hardware | |
9157 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
9158 | debugged. */ | |
a493e3e2 PA |
9159 | signal_program[GDB_SIGNAL_TRAP] = 0; |
9160 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
9161 | |
9162 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
9163 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
9164 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
9165 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
9166 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
9167 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
9168 | signal_print[GDB_SIGNAL_PROF] = 0; | |
9169 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
9170 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
9171 | signal_stop[GDB_SIGNAL_IO] = 0; | |
9172 | signal_print[GDB_SIGNAL_IO] = 0; | |
9173 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
9174 | signal_print[GDB_SIGNAL_POLL] = 0; | |
9175 | signal_stop[GDB_SIGNAL_URG] = 0; | |
9176 | signal_print[GDB_SIGNAL_URG] = 0; | |
9177 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
9178 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
9179 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
9180 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 9181 | |
cd0fc7c3 SS |
9182 | /* These signals are used internally by user-level thread |
9183 | implementations. (See signal(5) on Solaris.) Like the above | |
9184 | signals, a healthy program receives and handles them as part of | |
9185 | its normal operation. */ | |
a493e3e2 PA |
9186 | signal_stop[GDB_SIGNAL_LWP] = 0; |
9187 | signal_print[GDB_SIGNAL_LWP] = 0; | |
9188 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
9189 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
9190 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
9191 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
cd0fc7c3 | 9192 | |
2455069d UW |
9193 | /* Update cached state. */ |
9194 | signal_cache_update (-1); | |
9195 | ||
85c07804 AC |
9196 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
9197 | &stop_on_solib_events, _("\ | |
9198 | Set stopping for shared library events."), _("\ | |
9199 | Show stopping for shared library events."), _("\ | |
c906108c SS |
9200 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
9201 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 9202 | to the user would be loading/unloading of a new library."), |
f9e14852 | 9203 | set_stop_on_solib_events, |
920d2a44 | 9204 | show_stop_on_solib_events, |
85c07804 | 9205 | &setlist, &showlist); |
c906108c | 9206 | |
7ab04401 AC |
9207 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
9208 | follow_fork_mode_kind_names, | |
9209 | &follow_fork_mode_string, _("\ | |
9210 | Set debugger response to a program call of fork or vfork."), _("\ | |
9211 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
9212 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
9213 | parent - the original process is debugged after a fork\n\ | |
9214 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 9215 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
9216 | By default, the debugger will follow the parent process."), |
9217 | NULL, | |
920d2a44 | 9218 | show_follow_fork_mode_string, |
7ab04401 AC |
9219 | &setlist, &showlist); |
9220 | ||
6c95b8df PA |
9221 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
9222 | follow_exec_mode_names, | |
9223 | &follow_exec_mode_string, _("\ | |
9224 | Set debugger response to a program call of exec."), _("\ | |
9225 | Show debugger response to a program call of exec."), _("\ | |
9226 | An exec call replaces the program image of a process.\n\ | |
9227 | \n\ | |
9228 | follow-exec-mode can be:\n\ | |
9229 | \n\ | |
cce7e648 | 9230 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
9231 | to this new inferior. The program the process was running before\n\ |
9232 | the exec call can be restarted afterwards by restarting the original\n\ | |
9233 | inferior.\n\ | |
9234 | \n\ | |
9235 | same - the debugger keeps the process bound to the same inferior.\n\ | |
9236 | The new executable image replaces the previous executable loaded in\n\ | |
9237 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
9238 | the executable the process was running after the exec call.\n\ | |
9239 | \n\ | |
9240 | By default, the debugger will use the same inferior."), | |
9241 | NULL, | |
9242 | show_follow_exec_mode_string, | |
9243 | &setlist, &showlist); | |
9244 | ||
7ab04401 AC |
9245 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
9246 | scheduler_enums, &scheduler_mode, _("\ | |
9247 | Set mode for locking scheduler during execution."), _("\ | |
9248 | Show mode for locking scheduler during execution."), _("\ | |
f2665db5 MM |
9249 | off == no locking (threads may preempt at any time)\n\ |
9250 | on == full locking (no thread except the current thread may run)\n\ | |
9251 | This applies to both normal execution and replay mode.\n\ | |
9252 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ | |
9253 | In this mode, other threads may run during other commands.\n\ | |
9254 | This applies to both normal execution and replay mode.\n\ | |
9255 | replay == scheduler locked in replay mode and unlocked during normal execution."), | |
7ab04401 | 9256 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 9257 | show_scheduler_mode, |
7ab04401 | 9258 | &setlist, &showlist); |
5fbbeb29 | 9259 | |
d4db2f36 PA |
9260 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
9261 | Set mode for resuming threads of all processes."), _("\ | |
9262 | Show mode for resuming threads of all processes."), _("\ | |
9263 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
9264 | threads of all processes. When off (which is the default), execution\n\ | |
9265 | commands only resume the threads of the current process. The set of\n\ | |
9266 | threads that are resumed is further refined by the scheduler-locking\n\ | |
9267 | mode (see help set scheduler-locking)."), | |
9268 | NULL, | |
9269 | show_schedule_multiple, | |
9270 | &setlist, &showlist); | |
9271 | ||
5bf193a2 AC |
9272 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
9273 | Set mode of the step operation."), _("\ | |
9274 | Show mode of the step operation."), _("\ | |
9275 | When set, doing a step over a function without debug line information\n\ | |
9276 | will stop at the first instruction of that function. Otherwise, the\n\ | |
9277 | function is skipped and the step command stops at a different source line."), | |
9278 | NULL, | |
920d2a44 | 9279 | show_step_stop_if_no_debug, |
5bf193a2 | 9280 | &setlist, &showlist); |
ca6724c1 | 9281 | |
72d0e2c5 YQ |
9282 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
9283 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
9284 | Set debugger's willingness to use displaced stepping."), _("\ |
9285 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
9286 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
9287 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
9288 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
9289 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
9290 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
9291 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
9292 | NULL, |
9293 | show_can_use_displaced_stepping, | |
9294 | &setlist, &showlist); | |
237fc4c9 | 9295 | |
b2175913 MS |
9296 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
9297 | &exec_direction, _("Set direction of execution.\n\ | |
9298 | Options are 'forward' or 'reverse'."), | |
9299 | _("Show direction of execution (forward/reverse)."), | |
9300 | _("Tells gdb whether to execute forward or backward."), | |
9301 | set_exec_direction_func, show_exec_direction_func, | |
9302 | &setlist, &showlist); | |
9303 | ||
6c95b8df PA |
9304 | /* Set/show detach-on-fork: user-settable mode. */ |
9305 | ||
9306 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
9307 | Set whether gdb will detach the child of a fork."), _("\ | |
9308 | Show whether gdb will detach the child of a fork."), _("\ | |
9309 | Tells gdb whether to detach the child of a fork."), | |
9310 | NULL, NULL, &setlist, &showlist); | |
9311 | ||
03583c20 UW |
9312 | /* Set/show disable address space randomization mode. */ |
9313 | ||
9314 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
9315 | &disable_randomization, _("\ | |
9316 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
9317 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
9318 | When this mode is on (which is the default), randomization of the virtual\n\ | |
9319 | address space is disabled. Standalone programs run with the randomization\n\ | |
9320 | enabled by default on some platforms."), | |
9321 | &set_disable_randomization, | |
9322 | &show_disable_randomization, | |
9323 | &setlist, &showlist); | |
9324 | ||
ca6724c1 | 9325 | /* ptid initializations */ |
ca6724c1 KB |
9326 | inferior_ptid = null_ptid; |
9327 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd PA |
9328 | |
9329 | observer_attach_thread_ptid_changed (infrun_thread_ptid_changed); | |
252fbfc8 | 9330 | observer_attach_thread_stop_requested (infrun_thread_stop_requested); |
a07daef3 | 9331 | observer_attach_thread_exit (infrun_thread_thread_exit); |
fc1cf338 | 9332 | observer_attach_inferior_exit (infrun_inferior_exit); |
4aa995e1 PA |
9333 | |
9334 | /* Explicitly create without lookup, since that tries to create a | |
9335 | value with a void typed value, and when we get here, gdbarch | |
9336 | isn't initialized yet. At this point, we're quite sure there | |
9337 | isn't another convenience variable of the same name. */ | |
22d2b532 | 9338 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
9339 | |
9340 | add_setshow_boolean_cmd ("observer", no_class, | |
9341 | &observer_mode_1, _("\ | |
9342 | Set whether gdb controls the inferior in observer mode."), _("\ | |
9343 | Show whether gdb controls the inferior in observer mode."), _("\ | |
9344 | In observer mode, GDB can get data from the inferior, but not\n\ | |
9345 | affect its execution. Registers and memory may not be changed,\n\ | |
9346 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
9347 | or signalled."), | |
9348 | set_observer_mode, | |
9349 | show_observer_mode, | |
9350 | &setlist, | |
9351 | &showlist); | |
c906108c | 9352 | } |